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by nomel 1572 days ago
Not trying to be rude, but it's because it's intro Physics (F=m*a, with F coming from fuel, battery, or brakes), with an understanding that the process that generated that force has an efficiency that's less than 100%, mixed with a dash of intro Calculus (integral of force).
1 comments

Respectfully, intro physics mentions nothing about ICE operating most efficiently at 50 MPH.