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8. In this question, the unit vectors i and j represent the directions East and North respectively. Two forces act on an object, F1 and F2 where F1 = (2a -3)i + (b - 3)j and F2 = (4 + a)i + (2-a)j. (a) Given that the object is in equilibrium, find the values of the constants a and b; (b) If the object is accelerating on a bearing of 3150, show that 2a + b = 0. 9. Two constant forces are acting on a body of mass 2 kg. 10 seconds after starting to accelerate from rest, the velocity of the body is given by (30i + 20j) ms-1. (a) Calculate the resultant force acting on the body. Give your answer in vector form. (b) If one of the forces is given by (10i - 3j) N, what is the magnitude of the other force