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A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease

A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease with a constant angular acceleration -2.00 rad/s^2.

If the pulley's initial angular velocity is 5.50 rad/s , how long does it take before the angular velocity of the pulley is equal to 5.0rad/s5.0rad/s?

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