car can move north $($the positive direction$)$ or south along a straight road. Its position is given

by s$($t$)$ with s in feet and t in seconds.

s$($t$)=2$t$33$t$212$t $+8$

$($a$)$ Find the speed and acceleration of the car at t $=6$ sec$.$ Specify the units of each quantity.

$($b$)$ At t $=6$ sec$,$ is the car moving north or south? Is it speeding up or slowing down? Briefly

explain your reasoning based on part $($a$)$