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The length of an elastic string is a m w...

The length of an elastic string is a m when the tension is 4 N, and b m when the tension is 5 N. The length in metre when the tyension is 9 N, is

A

4a - 5b

B

5b - 4a

C

9b - 9a

D

a + b

Text Solution

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The correct Answer is:
B
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