⚛️ Physics · Motion in a Plane · NEET & JEE

A projectile has range R when fired at 15°. The same speed gives the same range when fired at an angle of:

Answer: 75.

A 75°
B 60°
C 45°
D 30°

Correct answer: A. 75°

Explanation: Complementary angles give equal ranges: 15° and (90° - 15°) = 75° produce the same horizontal range.

Projectile trajectories launched at 15, 30, 45, 60, 75 and 90 degrees at the same speed, each annotated with range R, maximum height H and time of flight T, with coloured dots marking equal time intervals

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.

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A projectile has range R when fired at 15&deg;. The same speed gives the same range when fired at an angle of:

Concept context

More Motion in a Plane questions

A projectile has range R when fired at 15°. The same speed gives the same range when fired at an angle of: