Problem 4 (10 points) A playground merry-go-round of radius R = 2.00 m has a moment of inertia I = 250 kg .m2 and is rotating at 10.0rev /min about a frictionless, vertical axle. Facing the axle, a 25.0 - kg child hops onto the merry-go-round and manages to sit down on the edge. What is the new angular speed of the merry-go-round? Solution