A vector is a quantity having both magnitude and direction. Therefore, in specifying a
force, one must state not only how large it is but also in what direction it acts.
Many physical quantities are vectors, such as force, velocity, displacement, and
A vector quantity can be represented graphically by a directed line segment, symbolized
by an arrow pointing in the direction of the vector quantity, with the length of the segment
representing the magnitude of the vector.
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