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@phaedral @futurebird @Infrapink @jacquiharper

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When traveling 20 miles per hour, your position is changing at the rate of 20 miles per hour. That's a rate of change in your position. A rate of change in position is the first derivative of position, also known as velocity. Velocity, in turn, also has its own first derivative, called acceleration, which is also the second derivative of position.