Two particles X and Y, of equal masses 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 with a initial velocity u. After a long time finally:
(a) X will stop, Y will move with a velocity u.
(b) X and Y will both move with a velocity u/2 each.
(c) X will stop, Y will move a velocity < u/2.
(d) both will move with a velocity < u/2.