Question

кинематика материальной точки

Answer 1

Как-то так

$\displaystyle \mathcal{L} = mv^2/2 - U(\mathbf{r},t)\\\\ \frac{\partial \mathcal L}{\partial \mathbf{r}}+\frac{d}{dt}\frac{\partial \mathcal L}{\partial \mathbf{v}}=0$