When the road is dry and coefficient of friciton is `mu`, the maximum speed of a car in a circular path is `10 ms^(-1)`. If the road becomes wet and coefficient of friction becomes `(mu)/4`, what is the maximum speed permited ?

Options

A. `5 ms^(-1)`
B. `10 ms^(-1)`
C. `20 ms^(-1)`
D. `4 ms^(-1)`

Answer

A

Explanation

For safe driving `v_(max)=sqrt(murg)`
`10=sqrt(murg)`
for wet road `v'=sqrt((mu)/(4) rg)= 5 m//s`