The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is 1/2 , the velocities of separation of the balls will be equal to

• A. original velocity in the same direction
• B. half the original velocity in the same direction
• C. half the original velocity in the opposite direction
• D. original velocity in the opposite direction