1. The problem statement, all variables and given/known data A child (mc = 36 kg) is playing on a merry-go-round (mm = 225 kg, R = 2.9m) that is initially at rest. The child then jumps off in a direction tangent to the edge of the merry-go-round. The child has a speed of 5.0 m/s just before she lands on the ground. What is the magnitude of the final angular velocity of the merry-go-round? 2. Relevant equations L = I*ω Li,c + Li,m = Lf,c + Lf,m I = (1/2)mmR2 for the merry-go-round. I = mcR2 for the child. 3. The attempt at a solution The initial angular momentum of the system is 0 so Li,c + Li,m = 0. So Lf,c + Lf,m = 0 (1/2)mmR2 * ωf + mcR2 * ωf = 0 (1/2)mmR2 * ωf = - mcR2 * ωf However when I plug the values for mass of the merry-go-round and the child as well as the radius for the merry-go-round I cannot seem to find a way to isolate ωf to one side of the equation, I just keep getting 0 rad/s.