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A playground merry-go-round of radius R = 1.80 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 24.0-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?
rev/min
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