I think I understand that driving faster increases drag because there’s more air pushing against your vehicle, but why is the drag for that distance greater at higher speeds? If a car is driving slower but across the same distance, wouldn’t the total impulse created by the drag be the same as going faster because it’s delivered over a greater time, even though it’s a smaller force at any given moment?
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Drag is a big factor but it is also because of gearing. Manufacturers will make the car most efficient around this speed because it is highway speeds in a lot of countries.
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