Vertical projectile motion: Grade 12 Past Paper Questions

A ball is thrown vertically upwards from the top of a building of height 25 m with an initial velocity. On its way down, the ball passes a door which has a height of 1,9 m and then strikes the ground. Ignore the effects of air friction. 3.1 Define the term free fall. 3.2 Calculate the: 3.2.1 Time taken for the ball to reach its maximum height. 3.2.2 Velocity with which the ball strikes the ground. 3.2.3 Time it took the ball to move from the top of the door to the ground. 3.3 Draw a velocity versus time graph for the motion of the ball from the moment that the ball is thrown upwards until it strikes the ground. Use the ground as zero reference. Clearly indicate the following on your graph: the velocity with which the ball was thrown upwards, the time taken by the ball to reach its maximum height, and the velocity with which the ball strikes the ground.

A hot-air balloon moves vertically downwards at a constant velocity of 3,4 m·s⁻¹. When the balloon is 15 m above the ground, a small ball is dropped from the balloon. The ball strikes the ground and bounces vertically upwards. The hot-air balloon continues to move downwards at the same constant velocity. Ignore the effects of air friction acting on the ball. 3.1 Define the term free fall. The sketch graph below (not drawn to scale) represents the positions of the ball relative to the ground from the time the ball is dropped until the time it reaches its maximum height after the first bounce. 3.2 Was the ball in free fall between t1 and t2 seconds? Write down either YES or NO. 3.3 Use only EQUATIONS OF MOTION to calculate: 3.3.1 The value of t1 indicated on the graph. 3.3.2 The height of the hot-air balloon above the ground at the instant when the ball struck the ground. 3.4 The ball was in contact with the ground for 0,2 s and left the ground with a vertical upward velocity of 7,2 m·s⁻¹. Use only EQUATIONS OF MOTION to calculate the value of t3 indicated on the graph.

A ball is thrown vertically upwards from the top of a building at a velocity of 20 m·s⁻¹. The velocity-time graph for part of the motion of the ball is shown below. 3.1 Define a projectile. 3.2 Write down the magnitude and direction of the acceleration of the ball. 3.3 Determine the: 3.3.1 Time taken for the ball to reach the maximum height. 3.3.2 Maximum height reached by the ball above the building. The ball continues in its motion and hits the ground 5 seconds after it was thrown. 3.4 Calculate the: 3.4.1 Speed with which the ball hits the ground. 3.4.2 Height of the building.

Ball A is dropped from rest from the top of a building 15,2 m high. After ball A has fallen 3,2 m, a second ball B is projected vertically upwards from the ground. After a while, the two balls strike the ground at the SAME time. Ignore the effects of air resistance. 3.1 Define the term free fall. 3.2 Calculate the: 3.2.1 Time taken for ball A to strike the ground. 3.2.2 Magnitude of the velocity with which ball B was projected from the ground. 3.3 On the same system of axes, draw position-time graphs to show the motions of both ball A and ball B from the instant ball A is dropped until the time it reaches the ground. Take the ground as the zero position. Label the graphs A and B. Clearly indicate the following on the graphs: the starting time for each ball, the initial position of each ball, the time when the balls strike the ground.

The graph below shows the velocity-time graph for a ball that is dropped and bounces. Ignore air resistance. Two learners argue about the ball in the scenario. One learner says the ball is a projectile, while the other disagrees. 3.1 Define the term projectile. 3.2 Describe the motion of the ball between points A and B on the graph above. 3.3 From the graph, determine the: 3.3.1 Direction in which the ball is moving between points C and D. 3.3.2 Number of times the ball bounces. 3.4 Using EQUATIONS OF MOTION ONLY: 3.4.1 Calculate the height at which the ball was dropped. 3.4.2 Determine the maximum height reached by the ball after it bounces off the ground.

The velocity-time graph below represents the entire motion of a ball of mass 250 g, thrown vertically upwards from a height of 52,5 m above the ground. The ball rises to a maximum height of 10 m above the point of launch, falls to the ground and bounces to an unknown maximum height. Ignore the effects of air friction. 4.1 Define free fall. 4.2 Calculate the: 4.2.1 Numerical value of t on the graph WITHOUT USING THE EQUATIONS OF MOTION. 4.2.2 Velocity at which the ball reaches the ground. 4.3 State Newton's second law in terms of momentum. 4.4 Calculate the magnitude of the force exerted by the surface on the ball during contact. 4.5 Draw the acceleration time-graph for the entire motion of the ball.

A ball of mass 0,5 kg is dropped from a height of 1,2 m onto a hard floor. It bounces to a maximum height of 0,8 m. The floor exerts a force of 50 N on the ball. Ignore the effects of air friction. 3.1 Write down the magnitude and direction of the force that the ball exerts on the floor. 3.2 Calculate the: 3.2.1 Velocity at which the ball strikes the floor. 3.2.2 Time taken by the ball to fall to the floor from the moment it is dropped. 3.2.3 Speed at which the ball leaves the floor. 3.2.4 Time that the ball was in contact with the floor. 3.3 Sketch a graph of position versus time representing the entire motion of the ball. USE THE GROUND AS ZERO REFERENCE. Indicate the following on the graph: the height from which the ball is dropped, the height reached by the ball after the bounce, the time at which the ball reaches the floor, the time at which the ball bounces off the floor.

A hot-air balloon is moving upwards at a CONSTANT UNKNOWN speed. 3.1 Is the hot air balloon in free fall? Choose from YES or NO. Give a reason for the answer. When the balloon is 200 m above the ground, a small stone A is dropped from the balloon. Another small stone B is dropped 5 s later from the balloon while the balloon is still moving upwards at constant velocity. Stone A strikes the ground at a speed of 62,68 m·s⁻¹. Ignore air resistance. 3.2 Calculate the: 3.2.1 Speed of the hot air balloon. 3.2.2 Time it takes stone A to strike the ground. 3.2.3 Distance between the hot-air balloon and stone B at the instant when stone A strikes the ground. 3.3 On the same set of axes, draw position-time graphs for both the hot-air balloon and stone A from the moment the stone is dropped until it strikes the ground. Use the ground as zero reference. Label your graphs BALLOON and A.

A ball is dropped from point A and reaches point B, h metres below point A, in time t. The ball takes 2 s to fall from point B to point C on the ground. The distance from point B to point C is 8h metres. Ignore the effects of air friction. 3.1 Define the term free fall. 3.2 Show, by means of calculations, that time t is equal to 1 second. 3.3 Using EQUATIONS OF MOTION ONLY, calculate the speed with which the ball reached point C. 3.4 Determine the height: 3.4.1 From which the ball was dropped. 3.4.2 Of the ball at point B. 3.5 Sketch a position versus time graph for the motion of the ball from the moment the ball was dropped until it reached point C. Take the GROUND AS THE ZERO POSITION. Indicate the following values on your graph: the position of the ball from which it was dropped, the time and position of the ball when it was at point B, the time taken for the ball to reach point C.

A soft ball with a mass of 0,3 kg is projected vertically upwards from the roof of a 45 m tall building with velocity v. It hits the balcony below with a velocity of 29,36 m·s⁻¹, and bounces off with a velocity of 13,77 m·s⁻¹. The balcony is 12 m above the ground. Ignore the effects of friction. 3.1 Define the term projectile. 3.2 Calculate: 3.2.1 The magnitude of the velocity v, with which the ball was thrown from the roof of the building. 3.2.2 The velocity with which the ball strikes the ground. It takes 8,2 s from the time the ball is released from the roof until it strikes the ground. 3.3 Calculate the NET FORCE that the balcony surface exerted on the ball.

Ball A is projected vertically upwards at a velocity of 20 m·s⁻¹ from the ground. On its way down, it passes point P with a speed of 6,87 m·s⁻¹. Ignore the effects of friction. 3.1 Define the term projectile. 3.2 Using EQUATIONS OF MOTIONS ONLY, calculate the: 3.2.1 Time taken for ball A to reach point P on its way down. 3.2.2 The height of point P above the ground. When ball A reaches point P, ball B is projected vertically upwards from the ground. The balls pass each other at point Q which is 8 m above the ground. 3.3 Calculate the speed at which ball B was projected. 3.4 On the same set of axes, sketch the position versus time graph for ball A and ball B from the time ball A was projected until both reach point Q. Take the ground as the zero position. Label the graph for ball A and ball B as A and B respectively. Indicate the following numerical values on the graph: the time taken for ball A to reach point P on its way down, the height of point P, the height of point Q.

A ball of mass 500 g is projected vertically downwards towards the ground from a height of 2 m at a velocity of 1,5 m·s⁻¹. The position-time graph for the motion of the ball is shown below. Ignore the effects of air friction. 3.1 Write down the maximum vertical height reached by the ball after the second bounce. 3.2 Calculate the: 3.2.1 Speed with which the ball hits the ground for the first time. 3.2.2 The time t indicated on the graph. 3.2.3 Velocity with which the ball rebounds from the ground during the first bounce. The ball is in contact with the ground for 0,2 s during the first bounce. 3.3 Calculate the force exerted by the ground on the ball during the first bounce. 3.4 Draw a velocity-time graph for the motion of the ball from the time that it is projected to the time when it rebounds to a height of 0,8 m. Clearly show the following on your graph: the time t indicated on the graph, the velocity of the ball when it hits the ground for the first time, and the velocity of the ball when it rebounds from the ground during the first bounce.

QUESTION 3 Ball A is thrown vertically upwards at 12 m·s⁻¹ from the top of a building. Two seconds after ball A was thrown upwards, ball B is thrown vertically downwards at 5,4 m·s⁻¹ from the top of the same building. Both balls, A and B, strike the ground at time t seconds. Ignore the effects of air friction. The position-time sketch graphs for both balls are shown below. 3.1 Using EQUATIONS OF MOTION ONLY, calculate the value of EACH of the following, as shown in the graphs: 3.1.1 t. 3.1.2 Z. 3.1.3 Y. 3.2 On the same set of axes, sketch the velocity-time graphs for ball A and ball B while they are in free fall. Label the graphs A and B for ball A and ball B respectively. Clearly indicate the following on the graphs: the initial velocity of each ball, the time at which each ball is thrown, the time at which the balls strike the ground.

QUESTION 3 A ball is projected vertically upwards from the edge of a cliff at 12 m·s⁻¹. The ball strikes the ground and bounces vertically upwards, reaching a maximum height at point E. The height of the cliff is 20 m, as shown in the diagram below. 3.1 State what is meant by a projectile. 3.2 Calculate the: 3.2.1 Time taken for the ball to reach maximum height (at point B). 3.2.2 Time taken for the ball to reach the ground from the moment it was projected. 3.3 Give an equation for a position versus time graph from the moment the ball was projected until it reaches the ground, in the form y = ax² + bx + c. Take the ground as zero position. 3.4 Sketch the velocity-time graph of the entire motion of the ball from the moment it was projected until it reaches the maximum height at point B. Clearly indicate the following on the graph: the initial velocity of the ball, the time at which the ball reaches the maximum height at B. 3.5 Use Newton's Laws and the necessary formulae to explain why free-falling objects of different weights have the same acceleration.

1.1 Several forces are acting on a moving object. Which ONE of the following statements is CORRECT when these forces are in equilibrium? A. The velocity of the object is increasing. B. The object is moving at a constant velocity. C. The kinetic energy of the object is decreasing. D. The object has a non-zero acceleration. 1.2 A stone thrown vertically downwards from the top of a building takes t seconds to strike the ground. Consider the acceleration-time graph below for the motion of the stone. The effects of air friction are ignored. What does the shaded area between 0 and t seconds, shown in the graph, represent? A. The final velocity of the stone. B. The change in position of the stone. C. The constant velocity of the stone. D. The change in velocity of the stone.

1.5 A ball falling vertically downwards from point A strikes the ground with velocity v and bounces, reaching a maximum height at point B, as shown in the diagram below. Which ONE of the combinations below is CORRECT for the direction of the impulse on the ball upon striking the ground and the magnitude of the velocity with which the ball leaves the ground? A. Upward, greater than v. B. Downward, greater than v. C. Upward, less than v. D. Downward, less than v. 1.6 The absorption spectrum of an element surrounding a moving star is observed on Earth and found to be red shifted. Which ONE of the following combinations is CORRECT for the movement of the star and the frequency of the observed light on Earth? A. Away from Earth, decreased. B. Towards Earth, decreased. C. Away from Earth, increased. D. Towards Earth, increased.

1.1 An astronaut with a mass of 70 kg is on a planet where his weight is 550 N. The gravitational acceleration on the planet is ... m·s⁻². A. 7,86. B. 0,13. C. 38 500. 1.2 A ball of mass m travelling to the right at velocity v strikes a wall and rebounds to the left at velocity 0,25v. The change in momentum of the ball is ... A. 0,75mv left. B. 1,25mv left. C. 0,75mv right. D. 1,25mv right. 1.3 A girl throws a ball upwards. Which ONE of the following combinations give the directions of the ball's velocity, acceleration, and the net force that the ball experiences as it travels upwards just after leaving the girl's hand?

1.1 Which ONE of the following quantities is the tendency of an object to resist a change to its state of motion? A. Inertia. B. Impulse. C. Momentum. D. Acceleration. 1.2 A ball is dropped from rest at a height above a concrete floor. The ball strikes the floor and bounces vertically up and down on the same spot on the floor. The velocity-time graph for the bouncing ball is shown below, with points P, Q, R and S representing different times during the motion. Ignore the effects of air resistance. At which time does the ball reach its maximum height after the first upward bounce? A. P. B. Q. C. R. D. S.

1.5 A hot-air balloon is moving vertically downwards at a CONSTANT SPEED. Assume that the mass of the hot-air balloon remains constant. Which ONE of the following physical quantities associated with the hot-air balloon changes during the motion? A. Weight. B. Momentum. C. Kinetic energy. D. Potential energy. 1.6 A learner standing at a roadside records the frequency of sound waves produced by the siren of an ambulance. The ambulance is moving at constant velocity along a straight horizontal road. The frequency-time graph for the detected sound is shown below. Which ONE of the following statements concerning the motion of the ambulance is CORRECT? The ambulance … A. approaches the learner and then passes the learner. B. moves away from the learner, then turns and approaches the learner. C. approaches the learner, then turns and moves away from the learner. D. moves away from the learner and then stops.

1.1 Which ONE of the following physical quantities is the rate of change of momentum? A. Impulse. B. Acceleration. C. Power. D. Force. 1.2 An object is dropped from the top of a tall building. After time t, the object's momentum is p. What will the momentum of the object be after time 2t? Ignore the effect of air friction. B. p. C. 2p. D. 3p. 1.3 A boy pushes a heavy box across a rough floor with a constant force of 250 N. The box experiences a constant frictional force of 50 N while it is moving. The magnitude of the force exerted by the box on the boy is ... A. 50 N. B. 200 N. C. 250 N. D. 300 N.

1.4 A ball is released from rest from a certain height above the floor and bounces off the floor several times. The position-time graph below represents the motion of the bouncing ball from the instant it was released from rest. Neglecting air resistance, which point (A, B, C or D) on the graph represents the position-time coordinates of the maximum height reached by the ball after the SECOND bounce? A. B. C. D. 1.5 Which ONE of the following pairs of compounds are FUNCTIONAL isomers? A. Methanol and methanal. B. Butane and 2-methylpropane. C. Propan-1-ol and propan-2-ol. D. Propanoic acid and methyl ethanoate. 1.6 Which ONE of the following compounds has the HIGHEST vapour pressure? A. Ethanal. B. Ethane. C. Ethanol. D. Ethanoic acid.

1.1 The physical quantity which is a quantitative measure of the resistance of an object to any change in its state of rest or motion is called ... A. Weight. B. Acceleration. C. Mass. D. Friction. 1.2 The magnitude of the gravitational acceleration on Earth is g. What will the value of the gravitational acceleration be on planet X, which has the same mass as Earth, but half the radius? A. ¼g. B. ½g. C. 2g. D. 4g. 1.3 Which one of the following best describes an inelastic collision? A. Both momentum and kinetic energy are conserved. B. Total kinetic energy is not conserved but total linear momentum is conserved. C. Neither kinetic energy nor momentum are conserved. D. Kinetic energy is conserved but total linear momentum is not conserved.

1.1 Which ONE of the following is NOT TRUE about the frictional force? A. Is proportional to the applied force. B. Is proportional to the normal force. C. Is independent of the area of contact. D. Is independent of the velocity of motion. 1.2 A ball is thrown vertically upwards. Which ONE of the following combinations of physical quantities of the ball have non-zero values at its highest point? Ignore the effects of air friction. A. Kinetic energy and time. B. Acceleration and weight. C. Displacement and momentum. D. Potential energy and velocity. 1.3 Which ONE of the following is equal to the rate of change of momentum? A. FΔt. B. Δp. C. ma. D. p.

1.3 The velocity-time graph below represents the movement of an object starting with an initial velocity v and moving under the influence of gravitational force only. The graph is not drawn to scale. The distance that the object travels in the time 5t is: A. vt. B. 15/2 vt. C. 17/2 vt. D. 21/2 vt.

3.4 Two isolated bodies, A and B, with masses M and 3M respectively, are placed a distance 2r from each other's centres. The gravitational force between them is F. The diagram is not drawn to scale. Determine the gravitational force between A and B in terms of F if the distance is increased to 6r. QUESTION 4 Ball A is dropped vertically downwards from the top of a high building with an unknown height h. ONE second later, another ball, B, is thrown vertically downwards from the same height with a speed of 20 m·s⁻¹. Ball B passes ball A when the balls reach the top of the window. The top of the window is 3 m above the ground. The diagram is not drawn to scale. Ignore the effects of friction. 4.1 Define the term free fall. 4.2 Use only equations of motion and calculate: 4.2.1 The velocity of ball A after falling for 2 seconds. 4.2.2 How long after ball A was dropped will ball B pass it. 4.2.3 The height of the building.

1.4 A ball is thrown vertically upwards into the air. Ignore the effects of air friction. The net force acting on the ball when the ball is at its highest point is ... A. Zero. B. Equal to the weight of the ball. C. Less than the weight of the ball. D. Greater than the weight of the ball. 1.5 Which ONE of the following statements is always true for inelastic collisions in an isolated system? A. Both momentum and kinetic energy are conserved. B. Both momentum and kinetic energy are not conserved. C. Momentum is conserved, but kinetic energy is not conserved. D. Kinetic energy is conserved, but momentum is not conserved. 1.6 An object moving horizontally at a constant velocity suddenly encounters a rough horizontal surface. The object continues to move over this rough surface. Which ONE of the following statements is correct? The net work done on the object during the motion over the rough surface is ... A. Zero. B. Positive. C. Negative. D. Constant. 1.7 The hooter of a car emits sound of constant frequency as the car moves away from a stationary listener. Which ONE of the following properties of the sound heard by the listener will NOT change? A. Speed. B. Frequency.

4.3 On the same set of axes, sketch the velocity-time graphs of the motion of ball A and ball B until they reach the ground. Label the graphs A and B respectively. Clearly indicate the following on your graph: the initial velocities of both balls; the times at which the balls reach the ground as t₁ for ball A and t₂ for ball B. 4.4 Ball A bounces and reaches a certain height above the window. The collision of the ball and the ground is elastic. Sketch the position-time graph for ball A from the moment it was dropped until it reaches the top of the window after the ball bounced from the ground. Take the ground as zero reference. Clearly indicate the initial and final height of the ball on your graph. A 4 kg metal object slides to the right at a constant speed of 7 m·s⁻¹ and it collides with a 5 kg metal object moving towards it at the same speed. They collide at point X. The collision lasts 0,03 seconds after which they stick together and move in the same direction. Ignore the effects of friction. 5.1 State Newton's Second Law in terms of momentum in words. 5.2 Calculate the: 5.2.1 Velocity of the combined system after the collision. 5.2.2 Average net force that the 4 kg object exerts on the 5 kg object. 5.3 What would happen to the magnitude of the impulse if softer objects were used and the net force remains the same? Write only INCREASES, DECREASES or REMAINS THE SAME. Explain the answer.

1.1 The gravitational force experienced by an object on the surface of a planet is inversely proportional to the … A. mass of the planet. B. mass of the object. C. square of the radius of the planet. D. radius of the planet. 1.2 A horizontal force F acts on a block placed on a rough horizontal surface. The block, starting from rest, moves to the right at constant acceleration. Which ONE of the following statements is CORRECT? A. F is equal to the kinetic frictional force. B. The momentum of the block increases. C. The net work done on the block is zero. D. The normal force is less than the weight of the block. 1.3 Objects A and B are thrown vertically upwards with velocities v and 2v respectively. Object A reaches a maximum height h. What is the maximum height reached by object B? Ignore the effects of friction. A. h. B. 2h. C. 3h. D. 4h.

1.1 Consider the statement below. The perpendicular force exerted by a surface on an object in contact with the surface. Which ONE of the following forces is defined by the statement above? A. Normal force. B. Resultant force. C. Frictional force. D. Gravitational force. 1.2 Two balls of masses m and 2m are dropped simultaneously from the same height above the ground. Ignore air resistance. When the balls strike the ground, which ONE of the following physical quantities will be the same for both balls? A. Weight. B. Velocity. C. Momentum. D. Kinetic energy.

1.3 The velocity versus time sketch graph below is for the motion of a ball that is projected vertically upwards from the top of a building. The ball reached its greatest height above the ground at a certain time. Which point on the graph corresponds to this greatest height? A. P. B. Q. C. R. D. S. 1.4 Two hard objects collide inelastically in an isolated system. Which ONE of the following statements is correct for this collision? A. Both total momentum and total kinetic energy are conserved. B. Neither total momentum nor total kinetic energy is conserved. C. Total momentum is not conserved, but total kinetic energy is conserved. D. Total momentum is conserved, but total kinetic energy is not conserved. 1.5 Engine P has a greater maximum power output than engine Q. Which ONE of the following statements is correct when P and Q each operate at their maximum power output? A. Q does more work than P in the same amount of time. B. P and Q do the same amount of work in the same amount of time. C. P and Q do the same amount of work, but Q does it in a shorter time than P. D. P and Q do the same amount of work, but P does it in a shorter time than Q.

1.1 A physics learner stands on a scale in a lift that is moving upwards at CONSTANT VELOCITY. The reading on the scale, compared to the reading when the lift was stationary, would be: A. zero. B. greater. C. smaller. D. the same. 1.2 Two blocks of masses m₁ and m₂ are connected to each other by a light inextensible string. The blocks are accelerated upwards by a force F. The tension in the string between the blocks will be: A. equal to F. B. equal to m₂g. C. less than m₂g. D. greater than m₂g. 1.3 A ball is dropped from a height h and hits the ground with a speed v. The speed of the ball at the moment when it reaches half its initial height is: A. v. B. v/√2. C. v/2. D. v/4.

QUESTION 1: MULTIPLE-CHOICE QUESTIONS. Various options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. 1.1 Which ONE of the following combinations consists of only SCALAR quantities? A. Velocity, speed and time. B. Time, distance and speed. C. Acceleration, speed and distance. D. Displacement, velocity and acceleration. 1.2 The acceleration due to gravity on Earth is g. Which ONE of the following represents the acceleration due to gravity on a planet that has TWICE the mass and HALF the radius of the Earth? A. g. B. 2g. C. 4g. D. 8g. 1.3 A ball is projected vertically upwards from the ground and reaches its maximum height after a while. Ignore the effects of air friction. How will the ACCELERATION and TOTAL MECHANICAL ENERGY of the ball at its maximum height compare to that immediately after it was projected? A. Both equal to the values immediately after it was projected. B. Acceleration greater than, but total mechanical energy smaller than, the values immediately after it was projected. C. Acceleration equal to, but total mechanical energy greater than, the values immediately after it was projected. D. Acceleration smaller than, but total mechanical energy equal to, the values immediately after it was projected.

QUESTION 1: MULTIPLE-CHOICE QUESTIONS. Various options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. 1.1 A book rests on a table. Which ONE of the following forces will form an action-reaction pair with the weight of the book? A. Force of the Earth on the book. B. Force of the book on the Earth. C. Force of the book on the table. D. Force of the table on the book. 1.2 A person is standing on a bathroom scale in a moving lift. Which ONE of the following motions of the lift will result in the SMALLEST reading on the scale? A. The lift accelerates upwards. B. The lift accelerates downwards. C. The lift moves upwards at a constant velocity. D. The lift moves downwards at a constant velocity. 1.3 The velocity versus time sketch graph below represents the motion of a ball which was in free fall. The ball struck the ground after 3t seconds. Which ONE of the following statements is CORRECT? The ball was … A. dropped from a height above the ground. B. thrown vertically upwards from the ground. C. thrown vertically upwards from a height above the ground. D. thrown vertically downwards from a height above the ground.

QUESTION 1: MULTIPLE-CHOICE QUESTIONS. Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A–D) next to the question number (1.1–1.6) in the ANSWER BOOK. E.g. 1.7 A. 1.1 If the net force acting on an object doubles while its mass remains constant, the acceleration will – A. Remain the same. B. Double. C. Be halved. D. Become zero. 1.2 The velocity-time graph for the motion of the ball from the instant it is projected from a cliff until it reaches point T is shown below. The quantity t₂ − t₁ represents: A. The time taken for the ball to reach maximum height. B. The duration of motion after the bounce until the ball reaches point T. C. The total time of flight. D. The time taken for the velocity to become zero for the first time.