(Solved): Please explain the solution step by step A circular steel bar having three segments is subject ...

Please explain the solution step by step

A circular steel bar having three segments is subjected to various forces at different cross-sections as shown in Fig. I, I4. Determine the necessary force to be applied at Section C for the equilibrium of the bar. Also, find the total elongation of the bar. Take $E=202\mathrm{GPa}$.