A car moving with a speed of 50 km/h, can be stopped by brakes after at least 6 m. If the same car is moving at a speed of 100 km/h, the minimum stopping distance is :

Options

A. 6 m
B. 12 m
C. 18 m
D. 24 m

Answer

d

Explanation

`"Stopping distance"=(K.E.)/("Force of distance")`
`S=(1/2mv^2)/(F)`
or `S prop v^2`
`:. (S_2)/(S_1)=(v_2^2)/(v_1^2)`
`:. (S_2)/(6)=((100)^2)/((50)^2)=4`
`S_2=24 m`