The cantilever beam in Figure P14.2 is supported on a spring at joint B. The spring stiffness is 10 kips/in. Given: E = 30,000 kips/in.2 (a) Compute the stiffness coefficient associated with a 1-in. vertical displacement at joint B. (b) Compute the vertical deflection of the spring produced by a vertical load of 15 kips. (c) Determine all support reactions produced by the 15-kip load.