A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn. The coordinates (meters) of the rabbit's position as functions of time \( t \) (seconds) are given by
and
\[
\begin{array}{l}
x=-0.31 t^{2}+7.2 t+28 \\
y=0.22 t^{2}-9.1 t+30
\end{array}
\]
(a) At \( t=15 \mathrm{~s} \), what is the rabbit's position vector \( \vec{r} \) in unitvector notation and in magnitude-angle notation?
position vecto given time, and nitude and ori
Calculations:
(We write \( \vec{r}( \) functions of \( t \),
\[
\text { At } t=15
\]