A person wants to drive on the vertical suirface of a large cylindrical wooden `well` commonly known as `death well` in a circus. The radius of the well 2 meter, and the coefficient of friction between the tyers of the motorcycle and the wall of the well is `0.2` the minimum speed the motorcyclist must have in order to prevent slipping should be

Options

A. `10m//s`
B. `15m//s`
C. `20m//s`
D. `25m//s`

Answer

A

Explanation

`muN=mg`
`mu(mv^(2))/(R)=mg` implies `v=sqrt((gr)/(mu))`
`=sqrt((10xx2)/(0.2))=10m//s` .