⚛️ Physics · Motion in a Plane · NEET & JEE

Deceleration of a particle is given by a = -kv. This means deceleration is proportional to:

Answer: Velocity.

A Position
B Time
C Velocity
D Acceleration itself

Correct answer: C. Velocity

Explanation: a = -kv means deceleration is proportional to current velocity.

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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Deceleration of a particle is given by a = -kv. This means deceleration is proportional to:

Concept context

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