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Physics/True Velocity

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Question
Really this is not homework, I'm 30 years old.

If a moon's velocity is 300 meters/second and it's orbiting a planet whose velocity is 500 meters/second, what is its actual velocity through space, or the equation to find it ?

Thanks,
Christine

Answer
I don't know where you got those numbers.  The moon goes around the Earth at the rate of about
1000m/s and the Earth goes around the sun at the rate of about 30000m/s.  There's no way to calculate the velocity through space since there's no reference position.  

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Richard J. Raridon

Expertise

I can answer most questions in undergraduate physics courses, including electricity and magnetism, atomic and nuclear, mechanics and optics.

Experience

I have taught undergraduate physics courses

Organizations
Sigma Xi, AAAS, SE section of APS

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BA in math, MA in physics, PhD in physical chemistry

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Fellow of AAAS

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