# Escape Velocity

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Escape velocity, abbreviated as $$v_e$$, is the minimum velocity required to leave a planet or moon or the minimum velocity to overcome the pull of gravity.

## Escape velocity formulas

$$\large{ v_e = \sqrt { \frac{ 2 \; G \; m}{r} } }$$
Symbol English Metric
$$\large{ v_e }$$ = escape velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ m }$$ = mass of the plamet or moon $$\large{ lbm }$$ $$\large{ kg }$$
$$\large{ r }$$ = radius from the center of mass (plamet or moon) to start point $$\large{ ft }$$ $$\large{ m }$$
$$\large{ G }$$ = universal gravitational constant $$\large{\frac{lbf-ft^2}{lbm^2}}$$ $$\large{\frac{N - m^2}{kg^2}}$$

Tags: Velocity Equations