A common misconception is that acceleration implies a POSITIVE change of velocity, while it could also mean a NEGATIVE one.
Formula for Acceleration
Let be the velocity of an object at a time and be the velocity of the same object at a time . If acceleration, , is known to be constant, then Note that velocity is a vector, so the magnitudes cannot be just subtracted in general.
If acceleration is not constant, then we can treat velocity as a function of time, . Then, at a particular instance,
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