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In a 'well of death' a rider drivesround...

In a 'well of death' a rider drivesround the inner wall of a hollow cylindrical chamber of diameter 20 m. If the coefficient of force of friction between tyres and inner wall of the hollow cylinder is 0.5, then the minimum speed of the rider without sliding down will be

A

`7 m//s`

B

`14 m//s`

C

`2 sqrt 7 m//s`

D

`7 sqrt 2 m//s`

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