A merry-go-round of radius r20m has a moment of inertia, Physics

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A merry-go-round of radius r20m has a moment of inertia

A merry-go-round of radius R=2.0m has a moment of inertia I=250kg m^2, and is rotating at 10rpm. A child whose mass is 25 kg and is at rest grabs onto the edge of the merry-go-round. The new angular speed (in rpm) of the merry-go-round is approximately?

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