The pin-jointed truss shown has a load W, of 7.5 kN and Z, 15.5 kN applied in the directions shown at point B. Assuming that all truss members are of equal geometric and material properties, determine the magnitude of the horizontal deflection at B (in m) to 5 significant figures with respect to the constants A and E. A 4m D W KN 3m Z KN 3m