a doctor is testing how much impact force does a 75kg athlete have on his knees when he jumps on his first jump, he landed with stiffed legs and it took .04m/s for him to stop. the athlete's velocity just before he hits the ground was 7.5m/s a) compute for the impact force b) how long will it take for the same athlete to stop when this time he experienced an average force of 280N with the same velocity just before he hits the ground?

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