The end of the cutter cord of an electric grass trimmer measures a length of 0.21. If the motor rotates at a speed of 20 rev / s, what is the tangential speed of the end of the cable?

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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                                         : )

thermal energy is the answer

i think it's 35 meters