Question

Stopping distance of a moving vehicle is directly proportional to 

(a) square of the initial velocity 

(b) square of the initial acceleration 

(c) the initial velocity 

(d) the initial acceleration

Answer 1

Correct option (a) square of the initial velocity   

Explanation:

Let s be the distance travelled by the vehicle before it stops. 

Final velocity X = 0, initial velocity = u 

Using equation of motion v² – u² = 2aS 

0² – u² = 2aS 

Stopping distance,  S =  – (u²/2a)