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Use the figure to the right to answer the next problem.
A ball of mass of mass m is tied with a light string to a vertical post of radius Rp and slides on a frictionless horizontal surface. As the ball travels around the post, the string wraps around the post, shortening the length. At t = 0 s, its speed is vo and radius is ro.
-What is the angular momentum of the ball after the string has wrapped once around the post?
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