D. The diagram below shows a system of five concurrent-coplanar forces FI, F2, F3, Fa and Fs. [+y] F1 = 4.25 kN F1 =4.0 KN [-x] - F3 = 4.0 > [+x] Fs = 6 KN F4 = 10.3 kN V[-y] Use either graphical or analytical methods to verify that the system of forces is in equilibrium. (8 marks) E. For the system of forces calculate the resultant vector. (6 marks) F 1 = 20N 30" FI = 20N (Total 20 marks) -24N