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What was its acceleration as it slowed down?

Express your answer in radians per second squared.

At t = 0 a grinding wheel has an angular velocity
of 24.0 rad/s. It has a constant angular
acceleration of 33.0 rad/s? until a circuit breaker
trips at time t = 1.60 s. From then on, it turns
through an angle 438 rad as it coasts to a stop at
constant angular acceleration.

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