If the road is unbanked and the coefficient of friction between the road and the tyres is 0.8, then the maximum speed with which an automobile can move around a curve of 84.5 m radius without slipping `(g=10ms^(-2))` is

Options

A. `26ms^(-1)`
B. `67.6ms^(-1)`
C. `13ms^(-1)`
D. `36.7ms^(-1)`

Answer

A

Explanation

`v=sqrt(muRg)`
or `v=sqrt(0.8xx84.5xx10)`
`=26ms^(-1)`