A motor lorry frame CADEBFG can beconsidered as a beam 4.2mlong and freely supported at point A and B 3m apart. The frame is subjected to concentrated loads of 5KN ,10KN , 15KN , and 10KN at C,D,E. and F, respectively. CA =0.3m.AD=0.9m. DE-1.2m.EF=0.9m. BF=0.6m. FG=0.3m. Draw to scale the shearing force bending moment diagrams and mark on them the principal values