If a squash ball comes to its starting point after bouncing off the wall several times, then...
Correct answer: D. Both total displacement and average velocity are zero
- A. Its total displacement is zero but its average velocity is non zero.
- B. Its total displacement is non zero but its average velocity is zero.
- C. Both total displacement and average velocity are non zero
- D. Both total displacement and average velocity are zero
Explanation
Since the initial point and final position are the same, the net displacement is zero and velocity is, in essence, the change in displacement over time so, if the displacement is 0, then the velocity is zero too so, D is the correct option.
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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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