A model airplane flies over an observer O with constant speed in a straight line as shown. Determine the signs (positive [p], negative [n], or zero [z]) for r, r, ï, 0, 0 and Ï for each of the positions A, B, and C. Position r A C B с 0 Answers: Choose "p" or "n" or "z" B 0 --- -X IL 0 0 0

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