Considering the system formed by springs in series: - llllllllllllllllll Answer the following questions, just True or False, no needs of explanation! 1 -1 0

1) [K]=k -1 3 2 is the stiffness matrix of the system if the nodes and elements are numbered 0 2 2 properly and stiffness constants are chosen properly. 3 -1

2) [K]=k -1 1 0 is the stiffness matrix of the system i the nodes and elements are numbered -2 0 2 properly and stiffness constants are chosen properly. -1 1 0 3) [K]=k 1 3 -2 is the stiffness matrix of the system if the nodes and elements are numbered 0 -2 2 properly and stiffness constants are chosen properly.