A 79.9 kg man steps off a platform 4.37 m above the ground. He keeps his legs straight as he falls, but at the moment his feet touch the ground his knees begin to bend, and, treated as a particle, he moves an additional 0.78 m before coming to rest. Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground while he slows down?
Note: Assume the acceleration while he is slowing down is constant.
Give your answer in Newtons to the nearest whole number.
Hint: Draw a free body diagram to aid in seeing the forces.