A machinist turns the power on to a grinding wheel, at rest, at time t=0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 29 rad/s. The wheel slows down uniformly at 2.7 rad/s^2 until the wheel stops/ In this situation , the average angular velocity in the time interval form t=0 s to t=25 s closest to :
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