' ' 7:! A playground merry-go-round of radius R = 2.15m has a moment of inertia of I = 238kgmA2 and is rotating at 12.8rev/min about a frictionless vertical axle. Facing the axle, a 28.9kg child hops onto the merrygo~round and manages to sit down on its edge. What is the new angular speed (in revolutions per minute) of the merry-go-round? Do not enter units. Tries one How much work was done by the child? :] was one A work done by child W = Ex - EI = 137. 66 J - 241. 953] W = - 77. 286J It was night, I fell asleep and couldn't respond