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A child of mass 60 kg sits at the center of a playground merry-go-round which is...

A child of mass 60 kg sits at the center of a playground merry-go-round which is spinning at 1.5 rad/s. The moment of inertia and radius of the merry-go-round are 150 kg×m2 and 1.2 m respectively. How much rotational kinetic energy does the system lose as the child moves to the edge of the merry-go-round? (Treat the child as a point mass.)

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