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• (cur) (last) 19:45, 7 October 2010 Ian (Talk | contribs) (243 bytes) (New page: <math>\begin{align} & \mathbf{v}=\frac{d\mathbf{r}}{dt}=(-4t)\mathbf{i}+(-10t)\mathbf{j} \\ & \mathbf{v}(2)=-8\mathbf{i}-20\mathbf{j} \\ & v(2)=\sqrt{{{8}^{2}}+{{20}^{2}}}=21\textrm{.}5\...)

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