# 4.47 .. CP Jumping to the Ground. A 75.0-kg man steps off a platform 3.10 m above the ground. He keeps his legs straight as he falls but his knees begin to bend at the moment his feet touch the ground; treated as a particle he moves an additional 0.60 m before coming to rest. (a) What is his speed at the instant his feet touch the ground? (b) If we treat the man as a particle what is his acceleration (magnitude and direction) as he slows down if the acceleration is assumed to be constant? (c) Draw his freebody diagram. In terms of the forces on the diagram what is the net force on him? Use Newton’s laws and the results of part (b) to calculate the average force his feet exert on the ground while he slows down. Express this force both in newtons and as a multiple of his weight.

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Question source: “University Physics with Modern Physics by Hugh Young and Roger Freedman

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