Constant Angular Acceleration: A machinist turns on the power to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 38 rad/s. The wheel is run at that angular speed for 30 s and then power is shut off. The wheel slows down uniformly at 2.1 rad/s2 until the wheel stops. In this situation, what is the angular acceleration of the wheel between t = 0 s and t = 10 s?
A. 3.8 rad/s2
B. 4.6 rad/s2
C. 5.3 rad/s2
D. 6.1 rad/s2
E. 6.8 rad/s2
Answer: A
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