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Required information A model of a person's arm is used for ergonomics studies. Distances are AB = 40 cm, /BC = 28 cm, and CD = 19 cm. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. V D C 50 13 30 B X Express + AD using polar vector representation, measuring orientation positive counterclockwise from the right-hand horizontal direction. (Round the final answers to four decimal places, Include a minus sign if necessary.) The polar representation of the resultant vector is T AD = cm @ + 4