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A thick walled hollow sphere has outer r...

A thick walled hollow sphere has outer radius `R`. It rolls down an inclined plane without slipping and its -speed at the bottom is `v`. If the inclined plane is frictionless and the sphere slides down without rolling, its speed at the bottom `5v//4`. What is the radius of gyration of the sphere?

A

`3 R_0 // 2`

B

`3 R_0 // 4`

C

`9 R_0 // 16`

D

`3 R_0`

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