1. The problem statement, all variables and given/known data 2. Relevant equations Inertia about pin = ml^2/3 Work done by rotation = M*theta = 0.5(Inertia about pin) *ω2 3. The attempt at a solution I tried two different methods and both came out to be the same answer. However they did not correspond to any of the multiple choice answers... What am I doing wrong? Thanks!