$9\mathrm{.}9-$ A bicycle wheel has an initial angular velocity of $1\mathrm{.}35ra\frac{d}{s}.$

$($a$)$ If its angular acceleration is constant and equal to $0\mathrm{.}310ra\frac{d}{s^2},$ what is its angular velocity at $t=2\mathrm{.}65s?($b$)$ Through what angle has the wheel turned between $t=0$ and $t=2\mathrm{.}65s?$