A flywheel

$($I $=72$ kg $$ m$2)$

starting from rest acquires an angular velocity of $204\mathrm{.}3$ rad$/$s while subject to a constant torque from a motor for $5\mathrm{.}9$ s$.$

$($a$)$

What is the angular acceleration $($in rad$/$s$2)$ of the flywheel? $($Enter the magnitude.$)$

rad$/$s$2$

$($b$)$

What is the magnitude of the torque $($in N $$ m$)?$

N $$ m