If an object is thrown upward at $128$ feet per second from a faight of SM fert formatiplaysions given by the following equation.

$S(t)=521282-1E^2$

$($a$)$ What is the average velocity $($in ff$/$sec$)$ in the frize $4$ seconds after it is throw?

$f\frac{t}{sec}$

$($b$)$ What is the average velocity $($in $\frac{f}{sec})$ in the next $4$ seconds?

$\frac{t}{sec}$