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Classical mechanics discusses the behaviour of macroscopic bodies under the influence of forces (without necessarily specifying the origin of these forces). If it's possible, USE MORE SPECIFIC TAGS like [newtonian-mechanics], [lagrangian-formalism], and [hamiltonian-formalism].

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Flight of an object with decreasing mass

Thanks to conservation of momentum and mass (as@g s pointed out), the centre of mass of the ball always moved as though it isn't shrinking.
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Validity of Conservation of Momentum

While proving the conservation of momentum, we assume that there is zero net force on the system, some parts of system may apply force on each other, but their net result for the system is zero, as th …
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Why gravitational potential away from a planet increases?

Ultimately, the aim of physics (and all sciences for that matter) is to make things easier and simpler to understand. Now, we could set an arbitrary point and describe that point as being present at z …
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