Why does fast working machine posses more power​

Power is the energy input per unit time. ... Therefore, if the more powerful train can go twice as fast as the less powerful train, it takes half as long, but requires 16 times more power to move at that speed.

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                                         : )

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