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A playground merry-go-round has a radius of 3.0 m and a rotational inertia of 600 kg-m^2....

A playground merry-go-round has a radius of 3.0 m and a rotational inertia of 600 kg-m^2. When the merry-go-round is at rest, a 20-kg child runs at 5.0 m/s along a line tangent to the rim and jumps on. The angular velocity of the merry-go-round is then:

.45 rad/s

1.2 rad/s

.38 rad/s

.56 rad/s

.71 rad/s

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