Question

A ball is falling after rolling off a tall roof. The ball has
a.kinetic energy only.
b.potential energy only.
c.both kinetic and potential energy.
d.neither kinetic or potential energy.

Answer 1

C.
Because it’s falling it has acceleration in the y direction. If you have acceleration, you usually also have velocity, and since kinetic energy is KE= Mv^2 you know you have it. It also has potential energy because it has some height to it, and PE= Mgh.

Answer 2

The ball has both kinetic and potential energy.