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The 'well of death' in a circus consists...

The 'well of death' in a circus consists of a vertical hollow cylinder of radius9m.A motorcyclist rides on its wall with sufficient speed to prevent him from sliding down. If coefficient of friction is 0.9, theminimumspeed the motorcyclistshould have is

A

`5 ms^-1`

B

`10 ms^-1`

C

`15 ms^-1`

D

`20 ms^-1`

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