1.

A car travelling at 40 km/h stops in a distance of 10m when brakes are applied. If the car was travelling at 80 km/h. What would be the stopping distance.

Answer»

u1 = 40 km/h

s1 = 10 m

u2 = 80 km/h

s2 = ?

Stopiing distance s = u2/2a

\(\frac{s_2}{s_1}=(\frac{u_2}{u_1})^2\) 

s2 = s1\((\frac{u_2}{u_1})^2\)

 = 10 \((\frac{80}{40})^2\)

s2 = 40 M



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