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David Abineri wrote:
>
> If one assumes that a projectile encounters an air resistance
> proportional to velocity, one can write a differential equation like
> mr''=-mgj - kr' which can be solved for r using an integrating factor
> e^(kt/m).
>
> The final solution for r, however, does not admit an interpretation for
> k=0. Why is it that one does not get the ideal case to come from this
> more general case when k=0?
>
> I hope that the question makes sense.