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A ring of mass m and radius R is acted u...

A ring of mass `m` and radius `R` is acted upon by a force `F` as shown in the figure. There os sufficient friction between the ring and the ground. The force of friciton force necessary for pure rolling is

A

`(F)/(2)` forward

B

`(F)/(3)` forward

C

Zero

D

`(F)/(4)` backward

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