(Answered) Hint apply conservation of angular momentum to find the new

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Hint: Apply Conservation of Angular Momentum to find the new speed of the puck,then calculate the change in Kinetic Energy to find the work that was done on the puck.The puck in the figure has a mass of 0.173 kg. Its original distance from the center of rotation is 30 cm, and the puck is moving with a speed of 72.1 cm/s. The string is pulled downward 19.5 cm through the hole in the friction less table. What is the magnitude of the work was done on the puck? Treat the hockey puck as a point mass. Answer in units of J.

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