Question

A car moving 36 kmh-1, suddenly sees child on road and immediately apply brakes and comes to rest in 2sec.
​Find (i) acceleration of car
​​(ii) distance travelled by car

Answer 1

Explanation:

u=36km/h = 5/18×36/1 = 10m/s

v=0

t=2sec

(i) a=v-u/t

= 0-10/2

= -10/2

= -5 m/s2

(ii)

${v}^{2} - {u}^{2} = 2as \\ ({0})^{2} - ({10})^{2} = 2 \times - 5 \times \: s \\ 0 - 100 = - 10s \\ - 100 = - 10s \\ \frac{100}{10} = s \\ s = 10m$

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