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Any single force is only one aspect of a mutual interaction between two bodies Hannah, J, Hillier, M J, Applied Mechanics, p221, Pitman Paperbacks, 1971• Cambridge UK: Cambridge University Press
I Bernard Cohen Peter M

Cambridge UK: Cambridge University Press.

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"On the use and abuse of Newton's second law for variable mass problems"
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] Consequently, the mass of the system can not change during the time of interest
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Celestial Mechanics and Dynamical Astronomy
Metaphysics Research Lab, Stanford University Quoting Newton in the Principia: It is not one action by which the Sun attracts Jupiter, and another by which Jupiter attracts the Sun; but it is one action by which the Sun and Jupiter mutually endeavour to come nearer together
I]t is essential to deal with the same set of particles throughout the time interval[ When the mass varies due to accretion or ablation, [an alternate equation explicitly accounting for the changing mass] should be used

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