The function

$x=(9\mathrm{.}0m)cos[(3ra\frac{d}{s})t+\frac{}{3}$rad$]$

gives the simple harmonic motion of a body. At $t=9\mathrm{.}8s,$ what are the $($a$)$ displacement, $($b$)$ velocity, $($c$)$ acceleration, and $($d$)$ phase of the motion? Also, what are the $($e$)$ frequency and $($f$)$ period of the motion?