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The bottom surface of a car will not be of smooth to make it Float. By the way, even a small boat, whose said surface is smooth, even at zero velocity, due to buoyancy force exerted by the water, it floats. If one really wants to make a ca (whose density is more than the water at displaced area)with smooth boat like bottom surface, the velocity should be such that the water should would exert a buoyancy force as if car density is less than water.

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15y ago

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