At t=0 a grinding wheel has an angular velocity of 21.0rad/s . It has a constant angular acceleration of 35.0rad/s^2 until a circuit breaker trips at time t = 2.50s . From then on, it turns through an angle 440rad as it coasts to a stop at constant angular acceleration.
(A) Through what total angle did the wheel turn between t=0 and the time it stopped?
(B) At what time did it stop?
(C) What was its acceleration as it slowed down?