What is meant by escape velocity?

Question:

What is meant by escape velocity?

Escape Velocity

When a certain velocity opposite to the direction of the gravitational pull is achieved one can escape the gravitational attraction of the planet. The escape velocity is given by:

$$\begin{align} v_e = \sqrt{\dfrac{2GM}{r}} \end{align} $$

Where:

G is the gravitational constant

r is the radius of the planet

M is the mass of the planet

Answer and Explanation:

In order for an object in a gravitational field to escape the gravitational pull exerted to it a escape velocity is required. The minimum velocity required to escape the gravitational attraction of a planet is the escape velocity. Mathematically it is related to the mass and the radius of the planet.


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Circular Velocity & Escape Velocity

from Basics of Astronomy

Chapter 25 / Lesson 5
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