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One of the (many) reasons that we feel your intuition might tell you that reversing the engine immediately reverses the direction is our wide experience with operating automobiles. In a car, the transmission is not designed to reverse the engine to slow the car. When the engine is in reverse either the car is moving backward or you are about to spend a few thousand dollars on your transmission. What feature do cars have (that is not present on the air/ice boat) to compensate for the fact that the engine cannot produce a significant acceleration in the direction opposite the car's motion?

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