question_answer

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 \[(g=10\text{ }m{{s}^{-2}})\]is

A)  \[26\text{ }m{{s}^{-1}}\]                             

B)  \[67.6m{{s}^{-1}}\]        

C)         \[13m{{s}^{-1}}\]           

D)         \[36.7m{{s}^{-1}}\]

E)  \[8.2\text{ }m{{s}^{-1}}\]