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What's the definition of the "d" in that formula?
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This equation assumes a constant force?It a basic calculus term: "differential" or "delta". It indicates a change.
In this case, most likely a change as a function of time.
https://en.wikipedia.org/wiki/Differential_calculus
No it doesn't. This is because to find W, you have to integrate F over the appropriate range of dr.This equation assumes a constant force?