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**Definition**:
**Displacement** is change in position,
= -
where is the final position and is the initial
position. The arrow indicates that displacement is a vector quantity: it has
direction and magnitude. In 1 dimension, there are only two possible
directions which can be specified with either a plus or a minus sign. Other
examples of vectors are velocity, acceleration and force. In contrast,
scalar quantities have only magnitude. Some examples of scalars are speed,
mass, temperature and energy.

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10/9/1997