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The speed of a transverse wave, going on...

The speed of a transverse wave, going on a uniform wire having a length 50 cm and mass 5.0g, is 80 m/s. the area of cross-section of the wire is 1.0 `mm^2` and it's young's modulus 16 `times 10^9` `Nm^-2`. Find the extension (in mm) of the wire over its natural length.

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