# Two boys at the merry go round!

In Figure above, a $$30 kg$$ child stands on the edge of a stationary merry-go-round of radius $$2.0 m$$. The rotational inertia of the merry-go-round about its rotation axis is $$150 kg m^{2}$$• The child catches a ball of mass $$1.0 kg$$ thrown by a friend. Just before the ball is caught, it has a horizontal velocity $$\vec{v}$$ of magnitude $$12 m/s$$, at angle $$\phi= 37°$$ with. a line tangent to the outer edge of the merry-go-round, as shown. What is the angular speed (in rad/sec) of the merry-go-round just after the ball is caught?

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