Answer: 10 km/h at angle.
- A 10 km/h at angle
- B 14 km/h under most conditions encountered
- C 2 km/h as frequently observed in practice
- D √28 km/h in many documented cases
Correct answer: A. 10 km/h at angle
Explanation: v<sub>rain</sub> wrt man = v<sub>rain</sub> - v<sub>man</sub> = (0,-8) - (6,0) = (-6,-8). |v| = √(36+64) = 10 km/h.
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.