You seem to be taking rate of growth as velocity. That ruins the analogy, because in physics, velocity isn't the rate at which the mass in increasing.
I don't see any way to break down OS momentum into analogies of mass and velocity.
But I don't think rate of growth is any part of an OS' momentum. Momentum is the tendency of a moving object to keep moving. An object with great momentum doesn't speed up or get larger. It just doesn't come to rest easily.
I see Solaris as having great momentum. Longtime users give an OS momentum. I can't tell how much momentum Linux has. New users are often easily switched to something else.
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