What was the avg force of vertical ground reaction force

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After crossing the finish line, the marathon runner stops, and then performs a celebratory vertical jump. At the moment of impact from this jump he has a vertical velocity of -.45m/s. If it takes .25 sec for him to come to a complete stop in the vertical direction, what was his acceleration during landing and what was his momentum at impact? Additionally, what was the avg. force of the vertical ground reaction force (GRF)?

Reference no: EM13332240

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