Verify superposition using your truss example, e.g., now, instead of loading the truss with 3 nodes, load one node at a time and show that the node deflections, forces, element strains and stresses add up to the values (of course within numerical error bounds) Note: You may work with your peers, yet the truss and the loading should be unique. Note also: Present your truss and your results in a neat and understandable way. Reporting is a very crucial element of FEM.