a car is moving at speed of 50km/hr ,can be stopped by brake at least at 6 m.If the same car is moving at speed of 100 km/hr ,what is the minimum stopping distance?

Answer 1

Vf^2-Vi^2=2aS
a=acceleration/deceleration
Vf=final velocity = 0
Vi=initial velocity = 50 or 100
S=distance travelled.
By proportion, double the initial velocity, will quadruple the stopping distance, with the same Vf and a.