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nickhuf098
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Homework Statement
a 2000kg lunar lander is in orbit 40km above the surface of the moon. it needs to move out to a 500km orbit in oder to link up with a mothership that will take the astronauts home. it wants the answer in joules
Homework Equations
??E2-E1=Work done by non conservative forces
The Attempt at a Solution
I get answers like 9.91*10^9 joules or negative 9.91*10^9
i thought that Total energy in an orbit=0 so i solved E(@40km)=mv1^2-GMm/r1=2000(v1^2-GM/40000+Rmoon)