A vac moving with a speed of `108 km //h` on level road where coefficient of friction between tyres and rod is 0.5 .For the safe driving of van the minimum radius of curvature of the rod will be `(g=10 m//s^(2))`

Options

A. 80 m
B. 40 m
C. 180 m
D. 20

Answer

C

Explanation

`V=sqrt(mu rg), V=180xx(5)/(18)=30`
`V^(2)= mu rg `
` therefore r = (v^(2))/(mu g)=(30xx30)/(0.5xx10)=180 m`.