⚛️ Physics · Motion in a Plane · NEET & JEE

A car decelerates from 20 m/s to rest in 4 seconds. Its deceleration is:

Answer: 5 m/s².

A 2.5 m/s²
B 4 m/s²
C 5 m/s²
D 8 m/s²

Correct answer: C. 5 m/s²

Explanation: a = (v-u)/t = (0-20)/4 = -5 m/s². Deceleration = 5 m/s².

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 car decelerates from 20 m/s to rest in 4 seconds. Its deceleration is:

Concept context

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