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Let's assume the drag coefficient for the borrowers is the same as that for a human. The drag force depends on the velocity and the area, which will be 144 times smaller, if your assumption of " twelve times smaller in each dimension" is correct. \begin{align} F_D &= 0.5 \rho V^2 S C_D \\ &= 0.5 \rho C_D V^2 \frac{S_{\rm human}}{144} \\ \end{align} ...

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