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The equation for calculating the force due to gravity.

F=G M1 M2 /(r^2)

Are M1 and M2 the mass's at rest or relativistic masses? So basically if the objects are traveling reaaaaaaaaaally fast. And their relativistic masses' increase does the force due gravity between them increase?

Thanks in advance.

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# F=G M1 M2 /(r^2)

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