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_{An aluminum wire of length 4.3 m and diameter 2.5 mm is connected to a steel wire of length 3.1 m and diameter 1.3 mm. Calculate the change in length (in mm) of this composite, if an object of mass 4 kg is hung from one end. The Young's modulus for aluminum is 7 ×× 10¹⁰ N m^-2, and the Young's modulus for steel is 20 ×× 10¹⁰ N m^-2.}

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