(Answered) Three children are riding on the edge of a merry-go-round

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Three children are riding on the edge of a merry-go-round that is 106 kg, has a 1.40-m radius, and is spinning at 18.0 rpm. The children have masses of 24, 30, and 33 kg. If the child who has a mass of 30 kg moves to the center of the merry-go-round, what is the new angular velocity in rpm?

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