Knowing that the constant of spring CD is k and that the spring is unstretched when rod ABC is horizontal, determine the value of u corresponding to equilibrium for the data indicated. P = 300 N, l =...

Knowing that the constant of spring CD is k and that the spring is unstretched when rod ABC is horizontal, determine the value of u corresponding to equilibrium for the data indicated.

P = 300 N, l = 400 mm, k = 5 kN/m

P = 75 lb, l = 15 in., k = 20 lb/in.