OK, this has been bugging me for a while. Why is it that(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\mathbf{v} \cdot \frac{d \mathbf{v}}{d t} = 1/2 v^2 [/tex]

where regular v is just the magnitude of bold v or more specifically where does the 1/2 coefficient turn up.

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# Dot product question

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