Tethod of Joints For the truss structures given below, determine reactions and member forces by the Method of Joints. Prior to solving each problem, determine if the structure is stable and statically determinate. Identify zero-force members, where possible, before solving for member forces to reduce the required calculations. B 00 1. 25 kips B 10 kips- A k 30 ft D E F 40 ft * 40 ft