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A playground merry-go-round (of mass 123 kg and radius 1.90 m) is rotating with an angular...

A playground merry-go-round (of mass 123 kg and radius 1.90 m) is rotating with an angular velocity of 4.42 rad/s. A 23.7 kg child, initially at rest, suddenly jumps on the merry-go-round by grabbing onto its outer edge. How much kinetic energy (in J) is lost in this inelastic collision?

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