⚛️ Physics · Motion in a Plane · NEET & JEE

The minimum number of coplanar vectors of unequal magnitude needed to give a zero resultant is:

Answer: 3.

Correct answer: A. 3

Explanation: Two unequal vectors can never cancel, but three unequal vectors can be arranged head to tail to form a closed triangle, giving zero resultant.

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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The minimum number of coplanar vectors of unequal magnitude needed to give a zero resultant is:

Concept context

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