Posted by **Paige** on Friday, October 22, 2010 at 12:43pm.

A freely rotating merry-go-round on a playground has a moment of inertia of 312 kgm2 and a radius of R=2.5 m. It is rotating with ω0=2.8 rad/s when a kid of mass 45 kg is standing on its outer rim. Neglecting friction, what is going to be the angular velocity of the merry-go-round after she walked d=0.7 m toward the center?

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