Why is it an average velocity


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It is important that you realize that this formula is for an average velocity.  (notice the bar over the v)

No matter how small a span of time you measure, it is still possible for the object to change its velocity within that time. 

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The longer the time period measured, the more it leads to calculating an average velocity.

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The shorter the time period measured the closer it brings you to calculating an "instantaneous velocity".  Only if the time period becomes zero would we truly have an instantaneous velocity. 

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