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two masses 2m and m are attached to the ...

two masses `2m` and `m` are attached to the the ends of a string while passing over a smooth Pulley of mass m and radius `R`. The ratio of tensions in both the strings is

A

`1 : 1`

B

`10 : 9`

C

`5 : 4`

D

`3 : 2`

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