A 1-dimensional vector can be described with a single scalar.  If the car is moving through a 3D space (like they usually do), then it should be described with 3 scalars (e.g. for x,y, and z if you want to go Cartesian).  But if the car is moving through a 1D space (e.g. I5), one scalar is plenty.

aaron
'87 syncro westy ej22

> Date: Thu, 24 Jan 2008 07:16:27 -0800
> From: bulletheadx@GMAIL.COM
> Subject: Re: NOVC Comment on fuel economy, drag and velocity
> To: vanagon@GERRY.VANAGON.COM
> 
> 'Along Interstate 5' is a direction... sort of.
> 
> Cya,
> Robert
> 
> On 1/24/08, Andrew Grebneff <andrew.grebneff@stonebow.otago.ac.nz> wrote:
> >
> > >  Average velocity along interstate 5
> > >  > was 80.6 mph
> >
> > It's only velocity if you state the direction. Velocity is a vector
> > quantity. Otherwise it's speed. The two terms are not interchangable.
> > --
> > Andrew Grebneff
> > Dunedin
> > New Zealand
> > Fossil preparator
> > Seashell, Macintosh, VW/Toyota van nut
> > � Opinions stated are mine, not those of Otago University
> > "There is water at the bottom of the ocean"  - Talking Heads
> >

_________________________________________________________________
i�m is proud to present Cause Effect, a series about real people making a difference.
http://im.live.com/Messenger/IM/MTV/?source=text_Cause_Effect