Question

A car moving with speed of 40km/hr can be stopped by applying brakes after atleast 2m if the same car is moving a speed of 80km/hr what is minimum stopping distance

Answer 1

A car moving with speed=40km/hr
Stopped by applying brake=2m
same car moving at speed= 80km/hr
stopped by applying brake=?
=80/40
=2m

therefore it requires same brake to stop the car.
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Answer 2

Answer:

The least stopping distance of the car is 8 m

Explanation:

Let the acceleration of the car is a

Initial speed u =40 km/h

Final speed v = 0

Stopping distance s = 2 m = 0.002 km

Therefore, by using the third equation of motion

v^2=u^2-2as

0= 40^2-2 x a x 0.002

a=4x10^5 km/h²

Now if the initial velocity u' = 80 km/h

Then, again from the third equation of motion

s'=u^2/2a

s'=80x80/2x4x10^5

s'=8x10^-3km

or s'=8m

Therefore, the stopping distance will be 8 m

Hope this answer is helpful.

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