A child runs and jumps onto a playground merry-go-round similar to the one shown. Once he lands on the merry-go-round, he holds the bar and the entire contraption spins. Compare the total (translational and rotational) kinetic energy and momentum of the child/platform system before and after he lands on the merry-go-round. energy before = energy after; momentum before > momentum after O energy before > energy after; momentum before = momentum after O energy before < energy after; momentum before = momentum after energy before > energy after; momentum before > momentum after energy before = energy after; momentum before = momentum after

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