# Escape Velocity in space

1. Jan 20, 2013

### athymy

1. The problem statement, all variables and given/known data

What is the escape speed of a spaceship fired in space, far away from Earth but at the same distance from the sun as the Earth.

2. Relevant equations

Ve = (2GM/r)^0.5

3. The attempt at a solution

The problem is that I don't know what the M or r is since it is fired from space... Should I just assume that the mass is the suns and for r I just add the suns radius with the distance from the earth to the sun?

2. Jan 20, 2013

### SammyS

Staff Emeritus
How far is Earth from the Sun ?

That's how far the spaceship is from the Sun .

3. Jan 20, 2013

### athymy

Ahh, so earth is approx. 150,000,000 km from the sun so is that my r value?

4. Jan 20, 2013

### Dick

Yes. Sure it is.

5. Jan 20, 2013