A solid sphere of radius R, mass M, and moment of Inertia I = 2/5MR2 is rolling down a hill. It starts at rest at a height h. Find its speed at the bottom of the hill. Compare this to the speed an object of mass M would have after sliding down a frictionless hill also of height h.
A solid sphere of radius R, mass M, and moment of Inertia I = 2/5MR2 is...