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Acceleration vs. time graphs tell us about an objectâs velocity in the same way that velocity vs. time graphs tell us about an objectâs displacement. The change in velocity in a given time interval is equal to the area under the graph during that same time interval.
D. Change in velocity divided by the time required for the change to occur is acceleration. 1  Acceleration occurs when an object slows down as well as speeds up. 2  A change in speed can be used to calculate acceleration.  Acceleration is final speed minus initial speed divided by time,