1. The problem statement, all variables and given/known data 2. Relevant equations Total energy = Translational kinetic energy + Rotational kinetic energy Total energy= 1/2 m V2 + 1/2 I W2 3. The attempt at a solution W= v/r = 3.20/0.100 = 32 rad/sec Total energy= 1/2 m V2+ 1/2 I W[2 Total enery = 1/2 (8)(3.20)2 + 1/2 (1.60x10-2) (32)2=49.152 Joule I found a different answer in solution. Why did he find the moment of inerta? it was already given in the problem + why didn't he square the angular velocity? Please tell me why he did that and if my answer or his answer is correct.