A disk of mass m = 0.200 kg is attached to a lightweight, taut string which keeps it in circular motion, as shown in the figure below. The disk slides on a horizontal table with negligible friction at speed v, = 75.0 cm/s, and the radius of its circular path is r, = 48.0 cm. The string passes a small hole in the table and is initially held in place. The string is then slowly pulled downward a distance of 12.0 cm. (a) What is the final angular velocity of the disk (in radians per second) ? (b) How much work (in J) is done on the disk? ?

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