At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. it has a constant angular acceleration of 25.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. from then on, the wheel turns through an angle of 440 rad as it coasts to a stop at constant angular deceleration.
through what total angle did the wheel turn between t=0 and the time it stopped? at what time does the wheel stop? what was the wheel's angular acceleration as it slowed down?
for the total angle i got 505 rads and that's wrong. i did 26x2.5 and then added 440 but it's wrong.
for the 2nd question i did the angular velocity divided by angular acceleration and got 1.04 and added it to 2.5 but that answer is wrong, too. i have no idea how to solve this problem at all.