Velocity interface shall be renamed as Speed

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All Quantity sub-interfaces are scalar quantities, except Velocity which is a 
vector quantity. This interface shall be renamed as Speed for consistency with 
the rest of the Quantity package.

More specifically, Speed is a scalar quantity that refers to "how fast an 
object is moving" while Velocity is a vector quantity that refers to "the rate 
at which an object changes its position" (see [1] and [2]). Speed is the 
magnitude of Velocity.

Note that the quantity package already uses Length (a scalar value) instead 
than Displacement (a vector value). Usage of Velocity is inconsistent with the 
above.

[1] http://www.physicsclassroom.com/class/1dkin/u1l1d.cfm
[2] http://en.wikipedia.org/wiki/Speed

Original issue reported on code.google.com by martdesr...@gmail.com on 26 Jan 2013 at 6:49

[GoogleCodeExporter]

Committed as of revision 240.

Original comment by martdesr...@gmail.com on 5 Feb 2013 at 7:13

• Changed state: Fixed