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Question

A particle P of charge q and mass m is placed at a point in gravity free space and its free to move. another particle Q , of same charge and mass , is projected from a distance r from P with an initial speed v₀ towards p . Initially the distance between P and Q decreases and then increases. Then what will be the speeds of particles P and Q when their separation is minimum?

Joshi sir comment

by momentum conservation mv₀ = 2mv₁

so v₁ = v₀/2

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