Question

A car travelling at a speed of 30 km/h is brought ti a halt in 4 m by applying breakes. if the same car is travelling at 90 km/h,it can be brought to halt with the same breaking power in:​

Answer 1

Answer:

At a car travelling at a speed of 30km/h is brought to rest in a distance of 4m by applying brakes if the same car is moving at a speed of 90km/h then that it can be brought to rest with same brakes in:

As we know:

$\frac{1}{2} m{v}^{2} = fs$

On the doubling, the speed and the required distance will become (4×8)m=32m

Hence 32m is your answer!