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In the arrangement shown, the pulleys, s...

In the arrangement shown, the pulleys, string and the spring balance, all the ideal. If `m_(1) gt m_(2)`, then the reading of the spring balance is

A

`m_(1) - m_(2)`

B

`(1)/(2) (m_(1)+m_(2))`

C

`(4m_(1)m_(2))/(m_(1)+m_(2))`

D

`(2m_(1)m_(2))/(m_(1)+m_(2))`

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