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 P: 16 So let me get this straight. If you consider the distance as the Δd, then you cannot consider the distance as d for a non-constant velocity (i.e. there is acceleration)? I guess this leads to a very interesting question (and probably the source of my confusion). In the equation $$v = d/t$$, what is the d stand for, physically? It surely cannot be the height; the height is Δd, right?