Answer
$v(t)=-32t\quad[ft/s]$
$\begin{array}{lll}
t & & v(t)\\
0 & & 0\\
1 & & -32\\
2 & & -64\\
3 & & -96\\
4 & & -128
\end{array}$
Work Step by Step
$a.\qquad v(t)=s^{\prime}(t)=0-16(2t)=-32t\quad[ft/s]$
$\begin{array}{lll}
t...[s] & & v(t)\\
0 & & -32(0)=0\\
1 & & -32(1)-32\\
2 & & -32(2)=-64\\
3 & & -32(3)=-96\\
4 & & -32(4)-128
\end{array}$
