1.

The length of a rubber cord is l_1 meters when the tension is 4N and l_2 meters when thetension is 5N. The length in meters when the tension is 9 N is

Answer»

`5l_(1) - 4l_(2)`
`5l_(2) - 4l_(1)`
`9l_(1) - 8l_(2)`
`8l_(2) - 5l_(1)`

Answer :B


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