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 21 rad/s. The wheel is run at that angular velocity for 39 s and then power is shut off. The wheel slows down uniformly at 2.2 rad/s2 until the wheel stops.
In this situation, the time interval of deceleration is closest to:
A) 14 s
B) 16 s
C) 10 s
D) 8 s
E) 12 s
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