Given: 400 lb force along the cable DA. Find: The force FDA in the Cartesian vector form. Plan: 1. Find the position vector 2. Obtain the force vector as and the unit vector "DA. FDA = 400 lb up . 2.10 FCA = 500 lb FBA = 350 lb 14 ft FDA = 400 lb B 3 ft. 6 ft- D 3ft 3 ft 3 ft 2 ft