Electrostatic question 1 (electric potential)

There are two identical particles each of mass m crying a charge Q. Initially one of them is at rest and another charge moves with velocity v directly towards free particle. Find the distance of closest approach.
This is an easy question what you simply have to do is apply the law of conservation of momentum and energy keeping in mind that velocity of both the particles are equal at the distance of closest approach. First try the question yourself and then look for the solution.
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