Intext example III — task. Science CBSE, Class 9.

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A motorcar is moving with a velocity of

$108\ km\ h^{-1}$ and it takes

$4\ s$ to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is

$1000\ kg$

From the Newton's second law, We know that,

$F\ =\ m \times a$
$F\ =\ \frac{m}{a}$

$F\ =\ \frac{m(v-u)}{t}$
$F\ =\ m \times (v-u) \times t$

Force exerted by the brakes

$=$

$N$ .s

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