There is a vertical asymptote when r = 0, where the gravity force tends to the infinite. The equation of the vertical asymptote is r = 0.
In this case we have the equation of the gravity force due to the interaction of two spherical objects. We notice that the gravity force is inversely proportional to the square of distance between the two objects. Thus, there is a vertical asymptote when r = 0, where the gravity force tends to the infinite. The equation of the vertical asymptote is r = 0.
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