43) Determine the value of k 50 that 1'13 : [2,5] and 1'5 : [k, 4] are perpendicular. 44) Determine the value of It so that 11' = [k, 3] and 13 = [1g 21:] are perpendicular. 45] Determine the work done by force g, in Newtons, for an object moving along the vector E, in meters. a) f5 = [5.2]. .'s' = [7,4] t) F 01:45.2 m d. = _. = 30" b) [100,400], 5 [12,27] 1F|=24m 46) Calculate the angle between the vectors in each pair. a] 33 = [728], if = [4,3] [I] f = [7.2],11' = [6,11] 41] ABC has points A(3,1), B{2,3), and C(5,6). Is it a rightangled triangle? If it is, identify the right angle. 42) Find a vector that is perpendicular to ii = [9,2]. Verify that the vectors are perpendicular. 43) Determine the value of k 50 that 11' = [2,5] and 13 = [k, 4] are perpendiCular