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In a well of death, motorcycle rider dri...

In a well of death, motorcycle rider drives round the inner wall of a hollow cylindrical chamber. If the radius of the cylindrical chamber is 8 m. What would be minimum speed of the rider to prevent him from sliding down?

A

10 `m//s`

B

20 `m//s`

C

30 `m//s`

D

40 `m//s`

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