See figure below. The space truss is supported by roller supports on the horizontal surface at C and D and a ball-and-socket support at E. The y-axis points upward. The mass of the suspended object is 100 kg. The coordinates of the joints are: A (1.6, 0.4, 0) m; B (1.0, 1.0, "-0.2)" m; C (0.9, 0, 0.9) m; D (0.9, 0, "-0.6)" m; and E (0, 0.8, 0) m. a) Find the reactions at the supports C, D, and E. (15) b) Find the axial forces in members AB, AC, and AD. (15)