Question

Two bodies of equal masses (m) moving with equal velocities (v) in opposite directions collide. The resultant velocity of the combination is:

• A. v
• B. 2v
• C. -v
• D. Zero

Answer 1

The correct option is D Zero

Answer is D.
When the balls of equal mass are moving at equal and opposite speeds, the total linear momentum of the system is zero. For linear momentum to be conserved after the collision, both balls must rebound with the same velocity.
Hence, the resultant velocity is zero.