I am just curious to know what the advantages are to using center of mass for velocity are in a system of particles?(adsbygoogle = window.adsbygoogle || []).push({});

Also, how did newton prove that the motion of the planets around the sun was the same as a projectile on earth (I understand that this helped prove the force of gravity was responsible for both, but i dont understand how he proved them inherently the same)

Thanks

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# Center of masses and proving gravity

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