1. The problem statement, all variables and given/known data Same mass sphere and cylinder are rolling on a horizontal plane. Which part of each objects kinetic energy does objects rotational energy make up? 2. Relevant equations Erotational = 1/2 Iw2 Ekinetic = 1/2 mv2 3. The attempt at a solution I know, that moments of inertia are: Icylinder = 1/2 MR2 Isphere = 2/5 MR2 And I know that: Etotal = Ek + Erotational What sould I do?