Changes

'''speed''' refers to the magnitude of the [[velocity]] of an object.

'''speed''' refers to the magnitude of the [[velocity]] of an object.

Speed is the total [[distance]] traveled divided by the [[time]] it takes to travel it<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>.  

Speed is the total [[distance]] traveled divided by the [[time]] it takes to travel it.<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>   

<math>Speed=\frac{d D}{d t}</math>

<math>Speed=\frac{d D}{d t}</math>

Note that speed is a [[scalar]], therefore it has no direction, and because it is a measure of magnitude, it is never negative.

Note that speed is a [[scalar]], therefore it has no direction, and because it is a measure of magnitude, it is never negative.

Like velocity, units for its measurement are [[meter]]/[[second]] and more commonly in informal circumstances [[kilometer]]/[[hour]] and [[mile]]/[[hour]].

Like velocity, units for its measurement are [[meter]]s/[[second]] (m/s), and more commonly in informal circumstances [[kilometer]]s/[[hour]] (kph) or (km/h) and [[mile]]s/[[hour]] (mph) or (MPH).

==References==

==References==

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[[category:physics]]

[[Category:Mechanics]]

[[category:mechanics]]