"\\frac{mv^2}{2}=qU=q(\\phi_1-\\phi_2)=q(kQ\/x-kQ\/(2x)-kQ\/(2x)+kQ\/x)"
"\\frac{mv^2}{2}=q(2kQ\/x-2kQ\/(2x))"
"\\frac{mv^2}{2}=q(kQ\/x)"
"v^2=\\frac{2kqQ}{mx} \\to v=\\sqrt{\\frac{2kqQ}{mx}}" Answer.
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