Explanation
ΔVV=hρgk=3×103×9.8×10322×108
=322×10−3×98=14711×10−3=1.34×10−2m
An iron rod of length 2m and cross- sectional area of 50mm2 stretched by 0.5mm, when a mass of 250 kg is hung from its lower end. Young's modulus of iron rod is
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