3. An Atwood machine is a device that consists of two masses connected by a string over a pulley, as shown in the figure. In this particular Atwood machine, m1 = 6.0 kg and m2 = 2.5 kg, and the two masses are released from rest, with m, at a starting height of 0.60 m above the table. When mị hits the table, it is moving with a speed of 2.0 m/s. If the pulley is a uniform disk with a radius of 15 cm, find the mass of the pulley. Hint: the pulley is NOT massless! Hint: m2 ends up at the same height as where m1 starts.

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