1. The problem statement, all variables and given/known data A hoop has a mass of 200g and a radius of 25cm (ICM = MR2 ). It rolls without sliding along level ground at VCM = 5m/s. What is it's total kinetic energy? 2. Relevant equations K = 1/2Iω2 ICM = MR2 v = rω 3. The attempt at a solution The answer is 5J, but I'm getting 2.5J. ICM = MR2 = (0.2)(0.25)(0.25) 0.0125 ω = v / r = 5/0.25 = 20 K = 1/2(0.0125)(20)2 = 2.5J Am I omitting something from the total kinetic energy equation?