When the 20-kip load is applied to joint B of the truss in Figure P10.9, support Asettles...

When the 20-kip load is applied to joint B of the truss in Figure P10.9, support Asettles vertically downward in and displaces  in horizontally to the right. Determine the vertical displacement of joint Bdue to all effects. The area of all bars =2in 2; E=30,000 kips/in2.