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A solid sphere of mass m and radius R is...

A solid sphere of mass `m` and radius `R` is placed over a plank of same mass `m`. There is sufficient friction between sphere and plank to prevent slipping. Force of friction between sphere and plank is

A

`(F)/(2)`

B

`(F)/(4)`

C

`(F)/(3)`

D

`(2F)/(3)`

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