1. The problem statement, all variables and given/known data What is the kinetic energy and total mechanical energy of a binary system of identical spheres orbiting around their common center of mass? M = mass R = radius 2. Relevant equations Force of gravity = GM^2/2R K = 1/2MV^2 3. The attempt at a solution I don't know whether or not you double the kinetic energy since there are two spheres.