A Bicycle Wheel Has an Initial Angular Speed of 7 $\text { one-half }$

A bicycle wheel has an initial angular speed of 7.2 rad/s.After turning through $\text { one-half }$ of a revolution,the angular speed is reduced to 2.2 rad/s.If the angular acceleration of the wheel was constant during the motion,how long will it take the wheel to make the $\text { one-half }$ revolution?

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