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A motor cyclist moving with a velocity o...

A motor cyclist moving with a velocity of `72 km h^(-1)` on a flat road takes a turn on the road at a point, where the radius of curvature of the road is 20 m. The acceleration due to gravity is `10 ms^(-2)`. In order to avoid skiding, he must not bend w.r.t. the vertical plane by an angle greater than :

A

`theta=tan^(-1)4`

B

`theta=tan^(-1)2`

C

`theta=tan^(-1) 6`

D

`theta=tan^(-1)3`

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