4. Four rigid bodies, 1, 2, 3, and 4, are connected by four springs as shown in the figure. A hori¬

zontal force of 1,000 N is applied on Body 1 as shown in the figure. Using FE analysis,

(a) find the displacements of the two bodies (1 and 3), (2) find the element force (tensile/compressive)

of spring 1, and (3) the reaction force at the right wall (Body 2). Assume the bodies can undergo only translation in the horizontal direction. The spring constants (N/mm) are k\ = 400, /C2 =

500, k?, = 500, and k4 = 300. Do not change node and element numbers.