Answer: 45°.
- A 45°
- B 30°
- C 60°
- D 90°
Correct answer: A. 45°
Explanation: Range R = u²sin2θ/g is greatest when sin2θ = 1, i.e. θ = 45°.
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.