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When the weight on a string is change fr...

When the weight on a string is change from 3.0 kg to 5.0 kgs the elengation changes from 0.61 mm to 1.02 mm. How much work is done during this extension of the string ? Find the Young's modulus of meterical of string if it is 1m in length and has a cross-sectional area `0.4 xx 10^(-4) m^2.`

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