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It was 6 radians per second.

Angular acceleration = -3 radians per second2

Initial angular velocity = 6 radians per second.

Final angular velocity = zero.

Average angular velocity = 3 radians per second.

Angular displacement in 2 seconds = 3 x 2 = 6 radians.

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Q: What is the angular velocity of the wheel before braking began if the wheel rotates through 6 radians in 2 seconds as it is uniformly brought to rest?
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