Rod AB consists of two cylindrical portions AC and BC, eac with a cross sectional area of 1750mm2. Portion AC is made of a mild stetel with a modulus of elasticity E=200Gpa and yield stress of sy= 250MPa, and portion CB is made of a high-strength steel with E=200GPa and sy= 345 MPa. A load P=975kN is applied at C as shown. Determine the vertical deflection at C and the stress in each portion of the rod.