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The length of an elastic string is 'a ' ...

The length of an elastic string is 'a ' meter when the longitudinal tension is 4N and 'b' meter when the tension is 5N . the length of the string (in meter) when the longitudinal tension is 9N is

A

a-b

B

5b-4a

C

`2b-a/2`

D

4a-3b

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The correct Answer is:
B
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