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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.
What is Earthâs speed and acceleration for all of these motions? Speed, Velocity, and Acceleration Explained. People often use the terms velocity and speed as if they are the same thing. Physicists, however, make a distinction between velocity and speed. Velocity includes direction, but speed does not. For example, a person running might have a speed of 6 miles per hour, but the personâs velocity might be 6 miles per hour towards the north. Most people also think of an acceleration as an increase in speed. Physicists define acceleration as any change in velocity, which includes direction.