Speed

:For alternate uses, see special education or speed (disambiguation).

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Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t.

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Speed is a scalar quantity with dimensions distance/time; the equivalent vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.

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Units of speed include:

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• metres per second, (symbol m/s), the SI derived unit
• kilometres per hour, (symbol km/h)
• miles per hour, (symbol mph)
• knots (nautical miles per hour, symbol kt)
• Mach, where Mach 1 is the speed of sound; Mach n is n times as fast.

::Mach 1 = ~343 m/s = ~1235 km/h = ~768 mi/h (see the speed of sound for more detail)

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• speed of light in vacuum (symbol c) is one of the natural units

::c = 299,792,458 m/s

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::1 m/s = 3.6 km/h

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::1 mph = 1.609 km/h

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::1 knot = 1.852 km/h = 0.514 m/s

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Vehicles often have a speedometer to measure the speed.

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The rate of change of speed with respect to time is termed acceleration.

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Speed: Average speed ►



 

Special education: : Special Ed redirects here. There is also a character of the same on the Comedy Central show, Crank Yankers....

Speed (disambiguation): Speed can refer to:...

Scalar: Scalar is a concept that has meaning in mathematics, physics, and computing....




Speed related Images and Photos (experimental)

Speed	Speed	Speed Racer	Speed Racer
Speed Racer	Speed Racer	Speed Racer	Speed Racer (BD)
Speed Racer (BD)	Speed Racer (DVD) (WS)	Speed Devils	Speed Bound Red