Correct answer
Aerodynamic drag from the air.
Aerodynamic drag. In comparable conditions it increases approximately with the square of speed relative to the air. Shape, frontal area and air density also matter. There is no universal 60 km/h threshold above which it is always the dominant resistance for every vehicle and situation.
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Engine power, which is a force from the air.
Aerodynamic drag from the air.
Friction between brake pads and the brake disc.
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