A hollow sphere of mass 15 kg and radius 8cm sits atop an inclined plane that is 10m in length and inclined at 30 degrees. The sphere starts at rest and rolls down the incline. What is the speed of the center of mass of the sphere at the bottom of the incline? At the Bottom of the incline what is the roational kinetic energy of the sphere? and What fraction of the sphere's total energy is rotational? I=(2/3)MR^2