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The puck in the figure below has a mass of 0.160 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 85.0 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.

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Given data The mass is, m = 0.160 kg The radiuses are, γ =40×10-2 m r, = 15×10 m The speed is, y = 85x 10-2 m/s From law of conservation of angular momentum, total initial angular momentum must be equal to final angular momentum. L-L mi mi 1: From Work energy theorem, the change in kinetic energy of the system is equal to amount of work done. 2 12 1: .(0.160)(85 0-1σ 10404015ㅟ (0.0578) (1.56) = 0.09J

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