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Two particles X and Y of equal mass and ...

Two 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

A

X will stop, Y will move with velocity u

B

X and Y will both move with velocities u/2 each

C

X will stop, Y will move with velocity `lt`u

D

Both will move with velocities `lt` u/2

Text Solution

Verified by Experts

The correct Answer is:
A
After along time separation will again be very large. Hence velocities again becomes same but interchanged (from momentum conservation and kinetic energy conservation).
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