Addition by 1. Components: Four vectors, 
, 
, 
, and 
, are shown in the figure. The sum of these four vectors is a vector having magnitude and direction 
A. 4.0 cm, along +x-axis.
B. 4.0 cm, along -x-axis.
C. 4.0 cm, along +y-axis.
D. 4.0 cm, along -y-axis.
E. 4.0 cm, 45° above +x-axis.
Answer: D
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