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Two particles \( \mathrm{X} \) and \( \mathrm{Y} \), of equal mass and with unequal positive charges, are free to move and are initially far away from each other. With Y at rest, \( \mathrm{X} \) begins to move towards it with initial velocity \( \mathrm{u} \). After a long
\( \mathrm{P} \) time, finally
(A) \( \mathrm{X} \) will stop, Y will move with velocity \( u \).
(B) \( \mathrm{X} \) and \( \mathrm{Y} \) will both move with velocities \( \mathrm{u} / 2 \) each.
W.
(C) \( \mathrm{X} \) will stop, \( \mathrm{Y} \) will move with velocity \( \mathrm{u} \)
(D) both will move with velocities \( \mathrm{u} / 2 \).
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