The 2014-T6 aluminum bar \(A B\) can slide freely along the guides mounted on the rigid crash barrier. If the railcar of mass \(10 \mathrm{Mg}\) is traveling with a speed of \(v=1.5 \mathrm{~m} / \mathrm{s}\), determine the maximum bending stress developed in the bar. The springs at \(A\) and \(B\) have a stiffness of \(k=15 \mathrm{MN} / \mathrm{m}\).

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k 300 mm k B 2 m 2 m 300 mm 400 mm Section a-a