A flat line on a speed graph - shows constant motion., acceleration = - any change in speed, A diagonal line on a speed graph - shows changing speed (acceleration)., A line on a speed graph that is above the axis is  - positive and moving AWAY from the origin., A line on a speed graph that is below the axis is - negative and moving TOWARD the origin., Aline that is moving farther from zero and the lower axis is - speeding up or increasing speed., A line that is moving closer to the zero or the bottom axis is  - slowing down., another way to say, "pick up speed!" = - to go faster or get faster, An athlete who is in "peak condition" is - in excellent shape or, a top athlete!, rate of acceleration = - how much speed changes as time changes,

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