Components: The eastward component of vector 
is equal to the westward component of vector 
and their northward components are equal. Which one of the following statements must be correct for these two vectors?
A. Vector 
is parallel to vector 
.
B. Vector 
is antiparallel (in the opposite direction) to vector 
.
C. Vector 
must be perpendicular to vector 
.
D. The magnitude of vector 
must be equal to the magnitude of vector 
.
E. The angle between vector 
and vector 
must be 90°.
Answer: D
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