Question

what two objects have stored energy? A. ball rolling on the ground B. a small rock sitting on top of a big rock C. a stretched rubber band D. a stone lying on the ground

Answer 1

The correct statements are:

B. a small rock sitting on top of a big rock

As the rock is at a height with respect to ground it has potential Energy

and

C. a stretched rubber band

A stretched rubber band has elastic potential energy

The others are actually moving and hence would consist of Kinetic energy. Potential energy is stored in objects that do not move and are stationary.

Answer 2

C and as other have expained below, B as well

Potential energy basically means something has the possibilty to change. A stretched rubber band could be released at any moment, which would then create kinetic energy. If the band wasn't stretched it wouldn't have any potential energy.