Two blocks with masses m1 = 2.50 kg and m2 = 9.60 kg are attached over a pulley with mass M = 2.80 kg hanging straight down as in Atwood's machine (see figure b). The pulley is a solid cylinder with radius 0.0540 m, and there is some friction on the axle. The system is released from rest, and the string moves without slipping over the pulley. If the larger mass is traveling at a speed of 2.49 m/s when it has dropped 1.00 m, how much mechanical energy was lost due to friction in the pulley's axle?
Wnc = J

Hint: This exercise is slightly easier than the associated example because the friction force need not be determined.

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