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A student (m = 74kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest a time

A student (m = 74kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest a time of 0.04s

The average force exerted on him by the ground is +18000 Where the upward direction is taken to be the positive direction From what height did the student fall? Assume that the only force acting on him during the collision is due to the ground.

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