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Tow particles X and Y, of equal mass an...

Tow particles `X` and `Y`, of equal mass and with unequal positive charges , are free to move and are initially far away from each other . With `Y` at rest , `X` begins to move towards it with initial velocity `u`. After a long time , finally .

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Equal electrostatic force (mutual interaction) acts on X and Y but in opposite direction which accelerate Y but retards X. After long time the velocity of X becomes zero while Y becomes u.
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