ABSTRACT
As seen for motions in one dimension (Chapter 2), the quantities displacement, velocity, and acceleration were allowed to change along one direction, the x-direction or the y-direction. To fulfill the vector aspect of these quantities as they change along one of the coordinate axes, say x, it was sufficient to have them assume positive or negative values. In other words, the sign of these quantities was indicative enough of the direction along which the quantity is pointing. Motion in two dimensions, however, is more involved and will require the use of vectors.
