7. A student (m = 63kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.040

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7. A student (m = 63kg) falls freely from rest and strikes the ground.During the collision with the ground, he comes to rest in a time of0.040 seconds. The average force exerted on him by the ground is+18000 N, where the upward direction is taken to be the positivedirection. From what height did the student fall? Assume that theonly force acting on him during the collision is that due to theground.