An automobile enters a turn of radius `R`. If the road is banked at an angle of `45^(@)` and the coefficient of friction is 1, the minimum and maximum speed with which the automobile can negotiate the turn without skidding is `:`

Options

A. `sqrt((rg)/(2))`
B. `(sqrt(rg))/(2)`
C. `sqrt(rg)`
D. zero

Answer

D

Explanation

`(N)/(sqrt2)-(muN)/(sqrt2)=(mv_("min")^(2))/(R)`

`v_(min)=sqrt((rg(tantheta-mu))/(1+mutan theta))rArrv_(min)=0,"as "mu=1`