A car is traveling at a rate of 18 feet per second when the brakes are applied. The position function for the car is given by $s(t) = -2.25t^2 + 18t$, where $s$ is measured in feet and $t$ is measured in seconds. Use this function to complete the table.\
\begin{tabular}{|c|c|c|c|c|c|}
\hline
t & 0 & 1 & 2 & 3 & 5 \\
\hline
s(t) & & 15.75 & 27 & & 33.75 \\
\hline
v(t) & & 13.50 & 9 & 4.50 & \\
\hline
a(t) & -4.50 & -4.50 & -4.50 & -4.50 & -4.50 \\
\hline
\end{tabular}
Find the average velocity during each time interval.
\begin{itemize}
\item ft/sec for [0, 1]
\item ft/sec for [1, 2]
\item ft/sec for [2, 3]
\item ft/sec for [3, 4]
\end{itemize}
