Jeff throws a ball straight up. For which situation is the acceleration zero? a.

Question

Jeff throws a ball straight up. For which situation is the acceleration zero?

a. at the top

b. on the way up

c. on the way back down

d. acceleration is not zero at any situation.

ANSWER IS NOT AT THE TOP

A ball with original momentum +4.0 kg m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:

a. - 8 kg m/s

b. + 8 kg m/s

c. - 4 kg m/s

d. Zero kg m/s

ANSWER IS NOT +8

The slope of the position vs. time curve represents:

a. the final position

b. the velocity.

c. the acceleration.

d. the displacement.

ANSWER IS NOT THE ACCELERATION

A crate of weight W is being pushed across a horizontal surface by a force directed at an angle of 20

Explanation / Answer

1. D

2 A

3. B

4. B

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