4. The 80-kg mass at A is suspended from the three cables that terminate at points 3.. C, and D. A has the coordinates (0, 0.61 0) n1 and each vertical post is 2 I11 in length. a.) Determine the position vectors r A3, rjm, and my. 1).) Determine the unit vectors {3,13, AC', and {3,113. (3.) Determine the tension (magnitude) experienced in cables AB, AC, and AD