Question

Stopping distance of vehicles when brakes are applied to a moving vehicle, the distance it travels before stopping is called stopping distance. It is an important factor for road safety and depends on the initial velocity and the braking capacity, or deceleration, that is caused by the braking. A car travelling at speed 72km/hr suddenly applies the brake with the deceleration of 5m/s2. Find the stopping distance of the car​

Answer 1

Answer:

28.8

Explanation:

Answer 2

Answer:

.

initial velocity = u (or v0)

final velocity= v =0

acceleration =-a

stopping distance=S

according to first equation of motion :

v=u+at

0 = u + (-a)t

u = at

°•° t = u/a ...(i)

according to second equation of motion :

S = u + 1/2at^2 ...{ii)

putting the value of (i) in (ii)

S = u×(u/a) + 1/2 ×(-a) × (u/a)^2

S = u^2/a - u^2/2a

S = 2u^2-u^2/2a

°•° S = u^2/2a

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