A playground merry-go-round of radius 1.92 m has a moment of inertia

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A playground merry-go-round of radius 1.92 m has a moment of inertia 411 kg m2 and is rotating at 10.4 rev/min. A child with mass 38.3 kg jumps on the edge of the merry-go-round. Assuming that the boy's initial speed is negligible, what is the new angular speed of the merry-go-round? Answer in units of rev/min.

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9.27 feet

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