Question

1. at what point does the tennis ball have zero gravitational potential energy? a. point a as it begins to fall to the ground. b. point b when it hits the ground. c. point c after it bounces up from hitting the ground. d. the tennis balls gravitational potential energy never reaches zero.

Explanation:

Gravitational potential energy is given by $U = mgh$, where $h$ is the height above a reference - level. When the tennis ball hits the ground, if we take the ground as the zero - potential level ($h = 0$), its gravitational potential energy is zero.

Answer:

B. Point B when it hits the ground.