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If the speed remains constant, we'll say that an i unit has Uniform Motion. Let's suppose in a certain t time the i(0) unit has coordinate E1,x the value A with a V speed. In that t' time it has a coordinate E1, x' with value B and a V' speed.
The quotient between the change of speed Dv=v'-v and the time interval in which that change has occurred, Dt=t'-t would be the average acceleration.

The instantaneous acceleration is the limit of the average acceleration when the interval Dt tends to zero.

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