The height $s($in feet$)$ at time $t($in seconds$)$ of a silver dollar dropped from the top of a building is

$($a$)$ Find the average velocity on the interval $3,5.$

$f\frac{t}{s}$

$($b$)$ Find the instantaneous velocities when $t=3$ and when $t=5.$

$s^{\text{'}}(3)=,f\frac{t}{s}$

$s^{\text{'}}(5)=,f\frac{t}{s}$

$($c$)$ How long will it take the dollar to hit the ground? $($Round your answer to two decimal places.$)$

s

$($d$)$ Find the velocity of the dollar when it hits the ground. $($Round your answer to one decimal place.$)$

$f\frac{t}{s}$