⚛️ Physics · Motion in a Plane · NEET & JEE

When two vectors are anti-parallel, the angle between them is:

Answer: 180.

A 180°
B 90°
C 45°
D 0°

Correct answer: A. 180°

Explanation: Anti-parallel vectors point in exactly opposite directions, so the angle between them is 180°.

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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When two vectors are anti-parallel, the angle between them is:

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