The puck in the figure below has a mass of 0.134 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 70.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. Hint: Consider the change in kinetic energy of the puck.

A string used to whirl a puck of mass m along a horizontal circular path on the surface of a table is shown. The string passes through a hole at the center of the circular path under the table where a hand pulls the string vertically down.

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