For Exercises 69–72, find the work done by a force F (in lb) in moving an object in a straight line from point A to point B. Assume that the units in the coordinate plane are in feet. (See Example 6) 69. A(0, 0), B(2, 6); F = 3i + 7j 70. A(0, 0), B(-5, 4); F = -2i + 10j 71. A(20, 35), B(32, 57); F = 150i + 200j 72. A(-14, -20), B(8, –35); F = 40i + 26j

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