Aradio-controlled car increases its kinetic energy from 4 j to 12 j over a distance of 2 m. what was the average net force on the car during this interval?

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                                         : )

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement