1. The problem statement, all variables and given/known data Two solid spheres -- a large, massive sphere and a small sphere with low mass -- are rolled down a hill. Which one reaches the bottom of the hill first? 2. Relevant equations ICM= (2/5)MR2 3. The attempt at a solution I thought that this would be the smaller sphere because it has a lower moment of inertia… but this isn't right. Can someone please explain?