When angular momentum is conserved, rotational speed may increase but can never decrease.
decreases if the mass moves farther from the axis of rotation.
increases if the mass moves farther from the axis of rotation.
must be constant.

he . if i may ask what i your question exactly?

explanation:

newton's first law of motion

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )