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In Physics, speed refers to the magnitude of the [[velocity]] of an object.
In [[physics]], 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 or sign.
Note that speed is a [[scalar]], therefore it has no direction or sign.
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]]/[[second]] and more commonly in informal circumstances [[kilometer]]/[[hour]] and [[mile]]/[[hour]].