A. T. B. answered • 09/01/16
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Your answer is correct. Since all three vectors are on the same straight-line, a diagram to me would be redundant. But if you must produce a diagram, then simply represent each vector as an arrow and connect the vectors head to tail. If you let 1 cm equal 100 m, then you will have a 5 cm arrow to the right then a 4 cm arrow to the left, then a 7 cm arrow connected to the head of the previous one, all vectors drawn horizontally. The result is a vector drawn from the tail of the first vector to the head of the last vector.
Steven W.
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A. T. B.'s answer is excellent. Regarding the diagram, I would only add that, sometimes, for clarity -- if I draw the line of motion horizontally -- I separate the three motions (represented by three arrows) just a bit vertically, even though they are all along the same line. But I make it clear they are all meant to be along the same line.
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09/01/16
Alex C.
09/01/16