Speed

Speed

In kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

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Famous quotes containing the word speed:

    “There was such speed in her little body,
    And such lightness in her footfall,
    It is no wonder her brown study
    Astonishes us all.”
    —John Crowe Ransom (1888–1974)

    “Wait, Kate! You skate at such a rate
    You leave behind your skating mate.
    Your splendid speed won’t you abate?
    He’s lagging far behind you, Kate.”
    —David Daiches (b. 1912)