when landing from jumping up, a person should bend hisknees to avoid injury. A 75kg man just before contact withthe ground has a speed if 6.4m./s
a) in a stiff legged landing (no bend in knees) hecomes to a halt in 2.0*10^-3s. what is the average force that actson him during this time.
b) when he bends his knees, he comes to a halt in 0.10 s. whatis the average force that acts on him during this time.