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A person is riding a bicycle, and its wheels have an angular velocity of +15.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +15.5 revolutions.
(a) How much time does it take for the bike to come to rest?
in sec

(b) What is the angular acceleration of each wheel?
in rad/sec2

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