A Machinist Turns the Power on to a Grinding Wheel,which

Multiple Choice

A machinist turns the power on to a grinding wheel,which is at rest at time .The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of The wheel is run at that angular velocity for 37 s and then power is shut off.The wheel decelerates uniformly at until the wheel stops.In this situation,the time interval of angular deceleration (slowing down) is closest to

A) 17 s.
B) 15 s.
C) 19 s.
D) 21 s.
E) 23 s.