Answer: vA - vB.
- A vA + vB
- B vA - vB
- C vB - vA
- D |vA| - |vB|
Correct answer: B. vA - vB
Explanation: Relative velocity of A with respect to B = vA - vB.

Projectiles at equal speed: range is maximum at 45°, and complementary angles (30° and 60°) share the same range. Image: Cmglee, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Vectors, projectile motion, uniform circular motion, and relative velocity - the foundation of 2D kinematics for NEET and JEE.