$(100$ XPs$)$ A non$-$linear spring is attached to a $2-$kg mass sitting on a smooth surface as shown.

The force exerted by the spring is given by the equation below, where $x$ is in meters, and $F$ is in

Newtons. The mass initially compresses the spring $0\mathrm{.}1$ m and is released from rest. Find the

maximum velocity of the mass.

$\{\begin{array}{c}\text{:}{F}_{sp}=1000x+600x^2\end{array}$