Two positively charged particles ` X` and `Y` are initially far away from each other and at rest , `X` begins to move towards `Y` with some initial velocity. The total momentum and energy of the system are `p` and `E`.

Answer

B

Explanation

IF Y is fixed i.e. another force is exist on Y additional to the mutual interaction between X & Y. So the net force on system (X & Y) is not zero p is charged but total always remain conserved.