Grawitacja

$F_{g} = G \frac{m_{1} m_{2}}{r^{2}}$

$\vec{γ} = \frac{{\vec{F}}_{g}}{m}$

$E_{pot} = - G \frac{m_{1} m_{2}}{r}$ $E_{pot} = m g h dla h < < R_{z}$

$v_{I} = \sqrt{\frac{G M_{z}}{R_{z}}} \approx 7,9 \frac{km}{s}$ $v_{II} = \sqrt{\frac{2 G M_{z}}{R_{z}}} \approx 11,2 \frac{km}{s}$