A railway track is banked for a speed v, by making the height of the outer rail h higher than that of the inner rail. The distance between the rails is d. The radius of the curvature of the track is r
A. `(h)/(d)=(v^(2))/(rg)`
B. `tan(sin^(-)(h)/(d))=(v^(2))/(rt)`
C. `tan^(-1)((h)/(d))=((v^(2))/(rg))`
D. `(h)/(r)=(v^(2))/(dg)`
