A solid body rotates about a stationary axis according to the law \( \phi=a t-b t^{2} \), where ...

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A solid body rotates about a stationary axis according to the law \( \phi=a t-b t^{2} \), where \( a=6.0 \mathrm{rad} \mathrm{s}^{-1} \) and \( b=2.0 \mathrm{rad} \mathrm{s}{ }^{-2} \). Find :
the mean values of the angular velocity and angular acceleration averaged over the time interval between \( t=0 \) and the complete stop;
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