2D Vectors
Key Questions

A quantity possessing both magnitude and direction, represented by an arrow the direction of which indicates the direction of the quantity and the length of which is proportional to the magnitude.

Resultant of vectors can be found using the law of cosines.
If A and B are two vectors with an angle between them equal to
#theta# (#theta < pi# ), their resultant R is given by,#R = [A^2 + B^2 + 2AB Cos theta]^(1/2)# , this gives the magnitude of R.If the vector R makes an angle
#alpha# with vector A, then#alpha = arctan [(B Cos theta)/(A + B Sin theta)]#