⚛️ Physics · Motion in a Plane · NEET & JEE

A runner completes one full lap around a circular track of radius R. The displacement is:

Answer: Zero.

A 2πR
B πR²
C R
D Zero

Correct answer: D. Zero

Explanation: After one full lap, the runner returns to the starting point. Net displacement = 0.

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 runner completes one full lap around a circular track of radius R. The displacement is:

Concept context

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