A steel rod clamped as its upper end, has a cross-sectional area of \(20 \mathrm{~cm}^{2}\). Between its lower end and a rigid plane, there was a clearance of \(0.375 \mathrm{~mm}\) before the load was applied. Determine the stresses in the upper and lower parts of the rod due to the force \(P=225 \mathrm{kN}\), as shown in Fig. 13.52. Take \(E=200 \mathrm{GPa}\).

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A B 2 m 1 m P 0.375 mm TITT Fig. 13.52