Assertion: The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies. Reason: Sometimes relative velocity between two bodies is equal to difference in velocities of the two bodies.

• A

  If both assertion and reason are true and reason is the correct explanation of assertion.
• Correct answer
  B

  If both assertion and reason are true but reason is not the correct explanation of assertion.
• C

  If assertion is true but reason is false.
• D

  If both assertion and reason are false.

Hence, the correct answer is option: 'B'.