Figure $2$ shows a truss structure adapted from a bridge. As a graduate engineer, you are

required to analyse the forces experienced by its various support members under

different loads. Develop a program that uses appropriate flow$-$control structures to

compute the forces experienced by the various members as loads from $500N$ to $10,000N$

are applied at point $(3)$ shown below. The program should also be able to plot the

evolution of force, $f_4,$ versus the afore$-$stated forces applied at point $(3).$

$[10$ Marks$]$