1. The problem statement, all variables and given/known data 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: A. √3 B. 1/2 C. √3/2 D. 3/2 E. 3 3. 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?