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A vehicle of mass $m$ is making a turn on a circular banked frictionless road of radius $R$. The angle of banking is $ \theta $.

The maximum speed with which it can travel without slipping is

$ \sqrt {gR} $

$ \sqrt {gR\sin\theta} $

$ \sqrt {gR\cos\theta} $

$ \sqrt {gR \tan\theta} $

$ \sqrt {gR \tan\theta \sin\theta} $