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If a string , suspended them the ceilin...

If a string , suspended them the ceiling is given a downward force `F_1` its length becomes `L_1` Its length is `L_2` . If the downward force `F_2` What is its actual length ?

A

`(L_1+L_2)/2`

B

`sqrt(L_1L_2)`

C

`(F_2L_1+F_1L_2)/(F_2+F_1)`

D

`(F_2L_1-F_1L_2)/(F_2-F_1)`

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