Consider the following three structures : 

Structure I : Beam with hinge support at A, roller at C, guided roller at E, and internal hinges at B and D

Structure II : Pin-jointed truss, with hinge support at A, and rollers at B and D

Structure III : Pin-jointed truss, with hinge support at A and roller at C

Which of the following statements is/are TRUE?

Consider the pin-jointed truss shown in the figure (not to scale). All members have the same axial rigidity, AE. Members QR, RS, and ST have the same length L. Angles QBT, RCT, SDT are all 90°. Angles BQT, CRT, DST are all 30°. The joint T carries a vertical load P. The vertical deflection of joint T is k$\rm \frac{PL}{AE}$. What is the value of k?

An idealised bridge truss is shown in the figure. The force in Member U2L3 is __________ kN (round off to one decimal place).