A Machinist Turns on the Power on to a Grinding

Multiple Choice

A machinist turns on the power on 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
The wheel is run at that angular velocity for 30 s,and then power is shut off.The wheel slows down uniformly at
Until the wheel stops.What is the total number of revolutions made by the wheel in this situation?

A) 510
B) 280
C) 320
D) 470
E) 750