::Speed

::concepts

Speed::distance    Velocity::speed    Average::second    Hewitt::object    Symbol::rotation    Divided::interval

{{#invoke:Hatnote|hatnote}} {{#invoke:redirect hatnote|redirect}} {{ safesubst:#invoke:Unsubst||\$N=Use British English |date=__DATE__ |\$B= }} {{#invoke:Infobox|infobox}} In everyday use and 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.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }} This is the likely origin of the speed/velocity terminology in vector physics.</ref> The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval;<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

Like velocity, speed has the dimensions of a length divided by a time; the SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour. For air and marine travel the knot is commonly used.

The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = {{safesubst:#invoke:val|main}} metres per second (approximately {{safesubst:#invoke:val|main}} or {{safesubst:#invoke:val|main}}). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

Speed sections