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a hockey puck of mass m is rotating about a fixed point on a frictionless table...

a hockey puck of mass m is rotating about a fixed point on a frictionless table with a radius R1. The puck is initially kept at this radius using a massless string that is run through a small hole in the table and has a translational speed of v1. Suppose the string is slowly pulled so that the puck has a new radius R2. you may assume the puck is a point mass. a)what is the puck’s new translational speed? b)What was the work done by tension in the string?
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