We say that the displacement of a particle is a vector quantity. Our best justification for this assertion is:
A. displacement can be specified by a magnitude and a direction
B. operating with displacements according to the rules for manipulating vectors leads to results
in agreement with experiments
C. a displacement is obviously not a scalar
D. displacement can be specified by three numbers
E. displacement is associated with motion
If the x component of a vector A, in the xy plane, is half as large as the magnitude of the
vector, the tangent of the angle between the vector and the x axis is:
The Attempt at a Solution
I'm pretty sure the answers are supposed to be A and A.
However the answer key states that it's B and D.
Is it wrong?