Consider the disk in $($Figure $1).$ The angular acceleration of the disk is defined by $=(3$t$2+16)$rad$/$s$2$$=(3$t$2+16)$rad$/$s$2,$ where tt is in seconds. The disk is originally rotating at $0$$0=16$ rad$/$srad$/$s$.($a$)$Determine the magnitude of the velocity of point AA on the disk when tt $=2$ ss$.($b$)$ Determine the magnitudes of the nn and tt components of acceleration of point AA on the disk when tt $=2$ ss$.$