We can express this proportionality as:
\[ \frac{f}{80.0 \, \text{dollars}} = \frac{p(u) - p(90 \, \text{km/h})}{p(190 \, \text{km/h}) - p(90 \, \text{km/h})} \]
where $f$ is the fine, $p(u)$ is the momentum of the vehicle at speed $u$, and $p(90 \, \text{km/h})$
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