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Because the engine provides the power to operate the drivetrain, which is what makes the car move in the first place. Turn the engine off, and there is no more power going to the drivetrain - the remaining movement of the car until it stops is simply inertia.

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9y ago

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Why does a fast car slow down if its switched off?

When a car is switched off, the engine stops running and there is no longer any power being generated to maintain the car's speed. Without the engine running, there is no energy being produced to keep the car moving, so it slows down due to the forces of friction and air resistance.


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