6-39. Determine the force in members IC and CG of the truss and state if these members are in tension or compression. Also, indicate all zero-force members. *6-40. Determine the force in members JE and GF of the truss and state if these members are in tension or compression. Also, indicate all zero-force members. B D 2 m E H G F -1.5 m 1.5m--1.5 m- 1.5 m- 6 kN 6 kN Probs. 6-39/40 2 m