Find the rotational kinetic energy of a spinning (not rolling) bowling ball that has a mass of 12 kg and a radius of 0.17 m moving at 3 m/s. (Fun fact: How can this problem be done if r isn't given?) v = r ISphere = 2/5 MR2 ICylinder = 1/2 MR2 IRing = MR2 IStick thru center = 1/12 ML2 IStick thru end = 1/3 ML2