Temporal variation rate of speed. Since speed is a directional vector or greatness, implying an intensity and a direction, can change in terms of a variation in intensity in the direction or in both. It follows that the acceleration is also a directional vector or greatness. If the speed of a body changes of υ1 m/s for υ2 m/s in t seconds, then the average acceleration has an intensity given by the following equation.

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