Rotational Kinematics with Constant Angular Acceleration: a Machinist Turns the Power

Multiple Choice

Rotational kinematics with constant angular acceleration: A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. 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