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The length of an elastic string is x whe...

The length of an elastic string is x when tension is 5N. Its length is y when tension is 7N What will be its length when tension is 9N?

A

`2y+x`

B

`2y-x`

C

`7x-4y`

D

`7x+5y`

Text Solution

Verified by Experts

The correct Answer is:
B
`kl=9`
`l=(9/k)`
`kx=5N`
`ky=7N`
`y=7/k`
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