The composite aluminum 2014-T6 bar is made from two segments having diameters of \(7.5 \mathrm{~mm}\) and \(15 \mathrm{~mm}\). Determine the maximum axial stress developed in the bar if the \(10-\mathrm{kg}\) collar is dropped from rest at a height of \(h=100 \mathrm{~mm}\).

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7.5 mm- 300 mm 15 mm T2001 h 200 mm