The description of the mechanical energy and the thermal energy at the time when the ball should be bounded at the time when there is the realization of the gravitational energy.
Force applied down to the ball:
At the time when the force is applied down to the ball so here the gravitational potential energy should be transformed into kinetic energy prior at the time when it should be hit to the earth. Kinetic energy should be transformed into vibration, thermal, and static electrical energy prior to the momentum of the ball that pushed the ball back up the hands of the people.
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