1. The problem statement, all variables and given/known data 2. Relevant equations I am aware that this can be done via energy methods. However, I wish to do it via: integral between t1 and t2 of Torques about point (say centre of the wheel) = change in angular momentum of the wheel. 3. The attempt at a solution The torque is mgR. t1 is zero. I get that the block hits the floor at t = (square root of 2gh)/g When I use the change in angular momentum equation, I get w (omega) final as (2.m. (square root of 2gh))/MR but this supposedly is not correct. Any ideas??