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Movement Speed \u200b\u200bGraphic Acceleration vs time

accelerated or varied movement is called to any movement whose speed does not remain constant, ie a movement in which the speed increases, decreases (slow) or change direction. This movement is typical of a roller-coaster car.

Acceleration is the change of speed over a period of time: a = delta v / delta t
where v = v (final) - v (initial)
The acceleration of a mobile can be as distance graph vs. time or velocity vs. time.