Advanced Mathematics - Vectors definition
Vectors are quantities that have both magnitude  and direction.
Scalars have magnitude only.
Speed is a scalar quantity. We speak of a car travelling at 60 km per
hour. If we wished to describe its velocity (a vector quantity), we would
need to add information about the direction in which it was travelling.
A vector is depicted as a directed line segment with an arrow head showing
the direction and the length of the arrow representing the magnitude.
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