Consider the acceleration, velocity and displacement of a tennis ball as it falls to the ground and bounces back. The direction of which of these changes in the process:
Correct answer: C. Displacement and velocity
- A. Velocity only
- B. Acceleration, velocity and displacement
- C. Displacement and velocity
- D. Displacement and acceleration
Explanation
During fall and rebound the ball's velocity and displacement change sign (direction). The acceleration due to gravity remains downward throughout, so only velocity and displacement reverse direction.
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About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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