motion - change in position, reference point - place or object used for comparison to determine if an object is in motion, position - a variable location that is relative to a reference point, speed - the distance an object travels per unit of time, velocity - speed in a given direction, slope - rise over run; vertical change over horizontal change, average speed - total distance divided by total time, equation - a mathematical expression that shows the relationship between variables, meter - the basic unit of length, conversion - to use a ratio or factor in order to compare one unit to another, instantaneous speed - how fast an object is moving at that moment in time,

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