At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips...

At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. From then on, it turns through an angle 438 rad as it coasts to a stop at constant angular acceleration.1.Through what total angle did the wheel turn between t=0 and the time it stopped?2.At what time did it stop?3.What was the wheel's angular acceleration as it slowed down?