Asked by Ama

Two horizontal vectors, 21 units North and 20 units East, are combined with a 10-unit vector
vertically upwards. Find the angle between the resultant of the three vectors and the vertical
one.
Answered by oobleck
The resultant is z = 20i + 21j + 10k
Find |z|.
If the angle is θ
10k • z = 10 * |z| cosθ
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