Escape Velocity Calculation for a Spaceship in Space

[athymy]

Homework Statement

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.

Homework Equations

Ve = (2GM/r)^0.5

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?

 

[SammyS]

Homework Statement

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.

Homework Equations

Ve = (2GM/r)^0.5

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 sun's and for r I just add the suns radius with the distance from the Earth to the sun?

How far is Earth from the Sun ?

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

 

[athymy]

How far is Earth from the Sun ?

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

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

 

[Dick]

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

Yes. Sure it is.

 

[athymy]

Yes. Sure it is.

Thanks for your help! :D