Gets the linear velocity of the Body from its center of mass.

The linear velocity is the ''rate of change of position over time''.


If you need the ''rate of change of angle over time'', use [[Body:getAngularVelocity]].
If you need to get the linear velocity of a point different from the center of mass:

*  [[Body:getLinearVelocityFromLocalPoint]] allows you to specify the point in local coordinates.
*  [[Body:getLinearVelocityFromWorldPoint]] allows you to specify the point in world coordinates.

See [http://books.google.com/books?id=g0-G2Dbk5vEC&lpg=PA250&ots=H6T6pJsOqu&dq=%22Essential%20Mathematics%20for%20Games%20and%20Interactive%20Applications%20local%20space&pg=PA136#v=onepage&q&f=false page 136 of "Essential Mathematics for Games and Interactive Applications"] for definitions of local and world coordinates.

== Function ==
=== Synopsis ===
<source lang="lua">
x, y = Body:getLinearVelocity( )
</source>
=== Arguments ===
None.
=== Returns ===
{{param|number|x|The x-component of the velocity vector}}
{{param|number|y|The y-component of the velocity vector}}
== See Also ==
* [[parent::Body]]
[[Category:Functions]]
{{#set:Description=Gets the linear velocity of the Body from its center of mass.}}
{{#set:Since=000}}
== Other Languages ==
{{i18n|Body:getLinearVelocity}}