If $\vec{PQ} = \vec a$, then $\vec{QP}$ equals:
A$\vec a$
B$-\vec a$
C$2\vec a$
D$\vec 0$
Answer & Solution
Correct answer: B. $-\vec a$
Reversing direction reverses sign: $\vec{QP} = -\vec{PQ} = -\vec a$. Same magnitude, opposite direction.
Related questions
The work done by a constant force F in displacement d isIf a, b, c are mutually perpendicular unit vectors, the value of a · (b × c) isIf position vectors of A and B are a and b respectively, then mid-point of AB has positionVectors a and b are collinear iffVolume of a parallelepiped with edges a, b, c isArea of the parallelogram having adjacent sides a and b isIf a = 2i + 3j − k and b = i − j + 2k then a · b equalsUnit vector along the vector i + j + k is