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- v = \begin{cases} \frac{1}{\beta}(\rho V-m)g(1-e^{-\frac{\beta}{m}t}) &\mbox малые v \\
- \sqrt{\frac{A}{B}}th(\sqrt{AB}t) & \mbox большие v \end{cases}
- m\frac{dv}{dt} = \begin{cases} \rho Vg-mg-6\pi \eta rv &\mbox малые v \\
- \rho Vg-mg-\frac{1}{2}C_D \rho v^2S & \mbox большие v \end{cases}
- \beta=6\pi\eta r \\
- A=(\rho V-m)\frac{g}{m} \\
- B=C_D\frac{8}{2m}S
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