A motor cyclist rides along a horizontal circle on the certicle cylindrical wall of a metal cylinder the radius of the cylinder is 10 m .If the speed is `20 m//s ` and accele ration due to gravity is `10 m//s ^(2)` then the least value of the coefficient of friction will be ,

Options

A. `0.25`
B. `0.45`
C. `0.35`
D. `0.15`

Answer

a

Explanation

`F= mu N `
` therefore mu= (F)/(N)=(mgr)/(mv^(2))=(gr)/(v^(2))=(10xx10)/(20xx20)=0.25`