A playground merry-go-round of radius r 200 m has a moment, Physics

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A playground merry-go-round of radius r 200 m has a moment

A playground merry-go-round of radius R = 2.00 m has a moment of inertia I = 245 kg m² and is rotating at 9.0 rev/min about a frictionless vertical axle. Facing the axle, a 27.0 kg child hops onto the merry-go-round and manages to sit down on its edge. What is the new angular speed of the merry-go-round?

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