to keep the calculations fairly simple, but still reasonable, we shall model a human leg that is 92.0 cm long (measured from the hip joint) by assuming that the upper leg and the lower leg (which includes the foot) have equal lengths and that each of them is uniform. for a 70.0 kg person, the mass of the upper leg would be 8.60 kg , while that of the lower leg (including the foot) would be 5.25 kg .