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This is about a person attempting a jump. 1.) Why is the ground reaction force decreasing...

This is about a person attempting a jump.

1.) Why is the ground reaction force decreasing during the counter-motion period when the person is squatting down?

2.) The centre of mass position of the person is decreasing during the counter-motion period when the person is squatting down. Therefore the gravitational potential energy of the person is also decreasing. Where is this energy initially going to and why?

3.) The person eventually reaches a minimum in the postion of their centre of mass. Explain why?
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