Re: # of members ?
Force from gravity is relative, sure:
F = G((M * m)/(d^2))
Where F is the magnitude of the force due to gravity, G is the gravitational constant (it is only sort of constant, as it depends on the units used), M and m are the two masses involved and d is the distance between the two masses. The direction is towards the other object.
Also, as Acceleration = Force/Mass, the acceleration is also relative.
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Of course, by the time I finish this post, it will already be obsolete. C'est la vie.
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