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... the natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force.
direct line segment
a line segment in which the endpoints are designated in a definite order.
a displacement distinguished by magnitude and direction but not by location.
a vector of length zero.
the point at the tail of a vector.
the point at the head of a vector.
... of a vector is always a positive quantity