4. The 20-kg mass is suspended by cables attached to three vertical 2-m posts. Point A is at (U, 1.2, 0) In. Determine the tensions in cables AB, AC, and AD. 5. The masses of the person and the diving board are 54 kg and 36 kg, respectively. Assume that they are in equilibrium. (a) Draw the free-body diagram of the diving board. (b) Determine the reactions at the supports A and B. 5. (a) Draw the free-body diagram of the beam. (b) Determine the reactions at the support. 2kN