Question

When a person jumps from some height to the ground, very large stresses are produced in the joints. If a NY Knick, Marcus Morris, Sr, who weighs 218 lbs, lands on the floor after a dunk (0.9 m above the floor), calculate the force in the knee joints (a) if he lands stiffly and compresses the joint materials 0.20 cm; (b) if he cushions the shock by flexing his legs upon striking the ground and his body moves 0.5 m in stopping. (c) Compare these forces with the weight of Marcus.

Answer 1