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A motorcyclist rides along a horizontal ...

A motorcyclist rides along a horizontal circle on the vertical cylindrical wall of a metal cylinder. The radius of the cylinder is 10 m. If the speed is 20 `m//s` and acceleration due to gravity is10 `m//s^2`, then the least value of the coefficient of friction will be,

A

0.25

B

0.45

C

0.35

D

0.15

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