A cantilever beam has a cross section and concentrated loads P === 30 kN and P == 10 kN, as shown. Com- pute (a) the maximum tensile and compressive bend- ing stress, and (b) the bending stress 2 m to the right of point A and 50 mm from the top of the beam. P P2 "B 1.8 m 3.2 m 35 mm 250 mm 35 mm 500 mm