Consider Four Spheres of Equal Mass and Size

Multiple Choice

Consider four spheres of equal mass and size. Which has the most potential energy?

A) a sphere on the top shelf of a bookshelf
B) a sphere rolling on the floor at the base of the bookshelf
C) a sphere sitting at rest on the floor at the base of the bookshelf
D) a sphere on the middle shelf of a bookshelf
E) a sphere that fell from the top shelf to the floor