# Escape velocity

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1. Jun 18, 2015

### Ajit Kumar

If an object is thrown upwards with escape velocity, will it orbit the earth?

2. Jun 18, 2015

Staff Emeritus
Think about it - If an object is thrown downwards with escape velocity, will it orbit the earth?

3. Jun 18, 2015

### Staff: Mentor

What does the word "escape" mean? Does that definition match the definition of "orbit"?

4. Jun 18, 2015

Staff Emeritus
So now you have two questions, approaching the problem from two different directions, These are hints. What do you think the answer is?

5. Jun 18, 2015

### Ajit Kumar

escape velocity is the velocity by which any object overcomes the gravitational pull and flies away from planet.
ve = √2gr

6. Jun 18, 2015

### Ajit Kumar

Will a body projected with a speed less than the escape velocity may orbit the earth in circular path?

7. Jun 18, 2015

### xAxis

Of course. All elliptic paths are closed orbits, so all speeds less than escape can take any elliptic path (of which the circular is special case)

8. Jun 18, 2015

### jbriggs444

For a body launched from the surface of the earth the only possibility for a circular orbit is a horizontal launch with a speed equal to escape velocity divided by the square root of two. Any other direction and the orbit will intersect with the surface of the Earth. Any higher velocity and the orbit will fail to be circular. It will rise above the surface of the earth. Any lower velocity and the orbit will fail to be circular. It will fall below the surface of the earth.