1.78: (a) Take the beginning of the journey as the origin, with north being the y-direction, east the x-direction, and the z-axis vertical. The first displacement is then , ˆ 30 k-the second is j ˆ 15-, the third is m) 200 km 2 .0 ( ˆ 200 = i , and the fourth is j ˆ 100 . Adding the four: k j i j i j k ˆ 30 ˆ 85 ˆ 200 ˆ
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