An object moves along the $y-$axis $($marked in feet$)$ so that its position at time $t($in seconds$)$ is given by the function:

$s(t)=60t-6t^2$

Part $1-$ Finding Velocity and Acceleration

Find the $($instantaneous$)$ velocity function $v(t)=$

Find the acceleration function $a(t)=$

Part $2-$ Evaluating Velocity and Acceleration

Include units in your answers for this part $($use ft to denote feet and $s$ to denote seconds$).$

Find the velocity at time $t=6$ :

Find the acceleration at time $t=6$ :