2023 · Q68
A car moving with a speed of 12 m/s is subjected to brakes which produces a deceleration of 6 m/s2. The car takes 2 s to stop after the application of brakes. What is the distance covered by the car after the application of brakes?
General KnowledgePhysics
- A12 m
- B24 m
- C36 m
- D48 m
Explanation
Using v^2 = u^2 + 2as with final velocity v = 0, initial velocity u = 12 m/s and deceleration a = -6 m/s^2: 0 = 144 - 12s, so s = 12 m. (Equivalently, average speed 6 m/s over 2 s gives 12 m.) The car covers 12 m after the brakes are applied.