1. The problem statement, all variables and given/known data Determine the position of the center of mass of a whole leg (a) when stretched out, and (b) when bent at 90°. Assume the person is 1.70 m tall. 2. Relevant equations 3. The attempt at a solution This is where I'm stuck...what's the mass? I doubt I can just use variable m because the mass is different parts of the leg. Also, when the problem says that the person is 1.7 m tall, should I use that for leg length and assume they meant leg length instead of height?