Two spheres are rolling without slipping on a horizontal floor. they are made of different materials, but each has mass 5.00 kg and radius 0.120 m. for each the translational speed of the center of mass is 4.00 m/s. sphere a is a uniform solid sphere and sphere b is a thin-walled, hollow sphere. how much work, in joules, must be done on the solid sphere to bring it to rest? how much work, in joules, must be done on the hollow sphere to bring it to rest?