An object with mass m$=0\mathrm{.}500$ kgkg is released from rest at x$=0$ and moves in the $+$x$+-$direction. If F$$ is the only force acting on the object,what is the object's speed when it reaches x$=0\mathrm{.}400$ mm$?$

Express your answer with the appropriate units. A conservative force F$$ is in the $+$x$+-$direction and has magnitude F$($x$)=$$/($x$+$x$0)2()=/(+0)2,$ where $=0\mathrm{.}450$ N$$m$2$N$$m$2$ and x$00=0\mathrm{.}200$ mm$.$