If the \(75-\mathrm{kg}\) man stands in the position shown, determine the state of stress at point \(A\) on the cross section of the plank at section \(a-a\). The center of gravity of the man is at \(G\). Assume that the contact point at \(C\) is smooth.

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a 1.5 m 12.5 mm 600 mm 300 mm 600 mm Section a- a and b - b 50 mm