Assertion : The relative velocity between any two bodies may be equal to sum of the velocities of two bodies. Reason : Sometimes, relative velocity between two bodies may be equal to difference in velocities of the two.

• 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'.