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The combination of an applied force and a frictional force produces a constant total torque of 38.1 Nm on a wheel rotating about a fixed axis. The applied force acts for 7.00 s, during which time, the angular speed of the wheel increases from 2.40 rad/s to 12.5 rad/s. The applied force is then removed. The wheel comes to rest in 78.4 s. What is the total number of revolutions of the wheel? Answer in units of revolutions.

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