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A playground merry-go-round of radius R = 1.80 meter has a moment of inertia I = 250 kg•m2 and is rotating at 9.0 rev/min about a frictionless vertical axle. Facing the axle, a 22.0 kilogram kid hops onto the merry-go-round and manages to sit down on its edge. Determine the new angular speed of the merry-go-round?

rev/min

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