Robert Link@llewelly @futurebird @Infrapink @jacquiharper I think when I read "rate of change" I assume the topic is "rate of change of the curve." However, that assumption was proved wrong by OP. Yes, 20mph is "a" rate of change. It is not, however a rate-of-change-of-a-curve, which is one of the mathematical questions I think calculus was invented to answer...the absurdity of "change over zero time."
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