Q 1353045844.     A train rounds an unbanked circular bend of radius `50 m` at a speed of `54 km h^{-1}`. If `g= 10 m//s^{-2},` the angle of banking required to prevent wearing out of rails is given by

A

`theta= tan^{-1}(0.15)`

B

`theta = tan^{-1}(0.25)`

C

`theta = tan^{-1} (0.35)`

D

`theta= tan^{-1}(0.45)`

HINT

`tan theta = frac{v^2}{Rg}`

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