A model of a person's arm is used for ergonomics studies. Distances are rAB = 30 cm, rBC = 28 cm, and rCD = 19 cm. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. £25° 30° Determine a unit vector ûAD in the direction om A to D. The unit vector ûAD in the direction from A to D is

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