Changes

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>