Moon earth system escape velocity

  • Thread starter bcjochim07
  • Start date
  • #1
bcjochim07
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Homework Statement


A projectile is fired straight away from the moon from a base on the far side of the moon, away from the earth. What is the projectile's escape speed from the earth-moon system?


Homework Equations


Escape velocity = sqrt[2GM/R]


The Attempt at a Solution



What I'm wondering is, do I just have to use this formula the moon or do I have to take the gravitational potential energy of the Earth and the projectile into account also?
 

Answers and Replies

  • #2
kamerling
454
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What I'm wondering is, do I just have to use this formula the moon or do I have to take the gravitational potential energy of the Earth and the projectile into account also?

Certainly. you need an equation for the energy needed to escape from the Earth and the moon, and you can add those energies.
 

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