Question

Two identical balls are approaching towards each other on a straight line with velocity 2 m/s and 4 m/s respectively. Find the final velocities of 2 balls after an elastic collision between them:

• A. 4 m/s and 2 m/s respectively
• B. 2 m/s and 4 m/s respectively
• C. 4 m/s and 4 m/s respectively
• D. 2 m/s and 2 m/s respectively

Answer 1

The correct option is A 4 m/s and 2 m/s respectively

Answer is A.
The two velocities will be exchanged and the final motion is reverse of initial motion for both.
That is, the final velocities are 4 m/s and 2 m/s.