A bar ABCD shown in figure below consists of three sections: AB is of 42 mm diameter and 80 mm long, BC is 65 mm square and 145 mm long, and CD is a circular section of 52 mm diameter and 70 mm long. What will be the total extension of the bar under the tensile load of 300 kN? E AB=185 GN/m², Ebc=200 GN/m², and Ecp=178 GN/m²

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