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Suppose you walk 18.0 m straight west and then 25.0 m straight north. How far are you from your starting point, and what is the compass direction of a line connecting your starting point to your final position? (If you represent the two legs of the walk as vector displacements A and B, as in Figure 21, then this problem asks you to find their sum R = A + B.

B
A
R
0
A + B = R
X
ZA
+
S
W
Figure 21. The two displacements A and B add
to give a total displacement R having
magnitude R and direction 0.

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