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QUESTION
Assume that the lower leg and the foot together have a combined mass of 4.1 {\rm kg}, and that their combined center of gravity is at the center of...
Assume that the lower leg and the foot together have a combined mass of 4.1 {rm kg}, and that their combined center of gravity is at the center of the lower leg. What is the magnitude of the force of the upper leg on the lower leg at the knee joint?
