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Q. A student (m = 70 kg) falls freely from rest and strikes the ground. Throughout the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000N, 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 throughout the collision is that as a result of the ground.

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