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The length of an elastic string is a metre when the longitudinal tension is 4N and b

The length of an elastic string is a metre when the longitudinal tension is 4N and b metre when the longitudinal tension is 5N. The length of the string on metre when the longitudinal tension is 9 N is

Options

(a) a-b
(b) 5b-4a
(c) 2b-a/4
(d) 4a-3b

Correct Answer:

5b-4a

Explanation:

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