The function x $=(2\mathrm{.}0$ m$)$ cos$[(5$ rad$/$s$)$t $+/4$ rad$]$ gives the simple harmonic motion of a body. Find the following values at t $=9\mathrm{.}0$ s$.$

$($a$)$ the displacement

m

$($b$)$ the velocity $($Include the sign of the value in your answer.$)$

m$/$s

$($c$)$ the acceleration $($Include the sign of the value in your answer.$)$

m$/$s$2$

$($d$)$ the phase of the motion

rad

$($e$)$ the frequency of the motion

Hz

$($f$)$ the period of the motion

s