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speed (spēd) n. 1. Physics The rate or a measure of the rate of motion, especially: a. Distance traveled divided by the time of travel. b. The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time. c. The magnitude of a ... - read more

Speed is formally defined as the rate of change of distance with regard to time. v = ds/dt This v is the instantaneous speed and the notation involves some knowledge of calculus. However, if we only want to calculate an average speed v avg , the following formula can be used: v avg = Δs/Δt ... - read more

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