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h2. Description
{table:align=right|cellspacing=0|cellpadding=1|border=1|frame=box|width=41%}{tr}{td:align=center|bgcolor=#F2F2F2}*[Model Hierarchy of Models]*{td}{tr}{tr}{td}{pagetree:root=Hierarchy of Models}{td}{tr}{table}
{excerpt}This model is applicable to a point particle moving with a constant velocity.  It is a subclass of the model [1D Motion with Constant Acceleration] defined by the constraint _a_ = 0.{excerpt}
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h2. Assumptions and Limitations

h4. Prior Models
* None assumed.

h4. Vocabulary
* [position (one-dimensional)]
* [velocity (one-dimensional)]

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h2. Model Specification

h4. System Schema

*Internal Constituents:* Point particle. 

*External Agents:* External influences must be absent or else cancel so that no acceleration results.

h4. Descriptors

*Object Variables:* None.

*State Variables:* v, x, t

*Interaction Variables:* None.

h4. Laws of Interaction

No net interaction is allowed.

h4. Laws of Change

{latex}\begin{large}$x = x_{\rm i} + v(t-t_{\rm i})$\end{large}{latex}\\

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h2. Relevant Examples

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