$(5$ pts$)16.$ A small rock is thrown straight upward with initial speed $8\mathrm{.}00\frac{m}{s}$ from the edge of the roof of a $9\mathrm{.}80$ m tall building. What is the speed of the rock just before it strikes the ground? Neglect air resistance.

$($a$)$ zero

$($b$)4\mathrm{.}0\frac{m}{s}$

$($c$)8\mathrm{.}0\frac{m}{s}$

$($d$)12\mathrm{.}0\frac{m}{s}$

$e($e$)16\mathrm{.}0\frac{m}{s}$

$($f$)$ none of the above answers