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After fixing a flat tire on a bicycle you give the wheel a spin. Its initial...

After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 6.15 rad/s and it rotated 12.8 revolutions before coming to rest.

A) What was its average angular acceleration? (in rad/s^2)

Express your answer using three significant figures.

B) For what length of time did the wheel rotate? (in seconds)

Express your answer using three significant figures.

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