Answer: 5 m/s.
- A 1 m/s
- B 7 m/s
- C 5 m/s
- D √7 m/s
Correct answer: C. 5 m/s
Explanation: v<sub>AB</sub> = v<sub>A</sub> − v<sub>B</sub> = (3, −4); magnitude = √(9 + 16) = 5 m/s.
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.