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 Related Terms
 Speed:  The rate of motion, measured in distance/time.
Distance: The amount of space between two points or things. Distance is always a non-negative number.
Rate: A comparison of two quantities that have different units of measure.
Ratio: A comparison of two quantities that have the same unit of measure.
Uniform Rate: Movement at a constant speed.
Unit Rate: A comparison of two measurements in which the second term has a value of 1.