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A massless rope is wrapped around a ring...

A massless rope is wrapped around a ring (with a groove along its circumference) having radius `R` and mass `m`. The ring is allowed to move download. The linear acceleration of the ring is

A

`(2g)/(3)`

B

`(g)/(2)`

C

`(g)/(3)`

D

g

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The correct Answer is:
B
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