Q 1466767675.     An elastic spring has a length `l_1` when tension in it is `4N`. Its length is `l_2` when tension in it is `5 N`. What will
be its length when tension in it is `9 N` ?

A

`5 l_1 -4 l_2 `

B

` 5l_2 -4l_1 `

C

`4l_1+5l_2 `

D

`4l_2+5l_1 `

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