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A car driver is negotiating a curve of r...

A car driver is negotiating a curve of radius 100 m with a speed of `18 km//hr.` The angle through which he has to lean from the vertical will be -

A

`tan^(-1)"1/40`

B

`tan^(-1)"1/4`

C

`tan^(-1)"((1)/(2))`

D

`tan^(-1)"((1)/(20))`

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