A ball A of mass 3m is placed at a distance d from the wall on a smooth horizontal surface. Another ball B of mass m moving with velocity u collides with ball A. The coefficient of restitution between the balls and the wall and between the balls is e a) the velocity of ball B after collision is u3e-14 b) the velocity of ball B after collision is u2e-14 c) after collision, ball A will move away by distance d2e+12e-1 during the time ball B returns back to wall. d) after collision, ball A will move away by distance de+13e-1 during the time ball B returns back to wall