For a curved track of radius R, banked at angle `theta`

Options

A. A vehicle moving with a speed `v_(0)=sqrt(Rg tan theta)` is able to negotiate the curve without calling friction into play at all
B. A vehicle moving with any speed `v gt v_(0)` is ablce to negotiate the curve with calling friction into play
C. A vehicle is moving with any speed `v lt v_(0)` must also have the force of friction into play
D. The minimum value of the angle of banking for a vehicle parked on the banked road can stay there without slipping is given by `theta=tan^(-1)mu_(s)` (`mu_(s)`=coefficient of static friction)

Answer

A, D