Question

A car was moving at a rate of 18 km/h.When the brakes were applied it comes to rest in a distance of 100 m. Calculate the retardation produced by the brakes.​

Answer 1

By newton's equation of motion

v^2-u^2=2as

So,here v=0

u=5m/s

s=100

0-25=2*100*a

a=-8m/s^2

Answer 2

Here is ur answer:

Using the equation of motion

${v}^{2} - {u}^{2} = 2as....(i)$

v=0, u=18km/h =5 m/s, S=100m

So, substituting the values in equation(i) we get

$a = \frac{ - 5 \times 5}{2 \times 100} = - \frac{1}{8}$

$= - 0.125 {m}</strong><strong>/</strong><strong>{ {s}^{2} }$

So, the retardation produced by the brakes is $0.125 {m}</strong><strong>/</strong><strong>{ {s}^{2} }$

Hope this will help you ❤