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The direction of the sum of the two displacement vectors 10 m at 0 and 20 m at 120 is (all angles are counter-clock-wise

The direction of the sum of the two displacement vectors 10 m at 0 and 20 m at 120 is (all angles are counter-clock-wise with the positive x axis) a. 90 O b. 180 O c. 0 O d. 270

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