Two positive point charges $+$q is x$-$axis at points x$=$a and x$=+$a and the third negative charge $$q is y$-$axis at points y$=$a$,$ where q$=5\mathrm{.}5$nC and a$=6\mathrm{.}5$cm$.$ The positive charges are fixed in place, but the negative charge is free to move. Calculate the velocity of the negatively charged particle at the origin $(0,0)$ when the particle leaves rest from the point $(0,$a$\mathrm{ )}$ and its mass m$=8\mathrm{.}5$mg.

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