Whether the car will land on its 4 wheels or not is subjective to the car's centre of mass and the height of the cliff. As soon as 2 of the car's wheels are off the cliff, the car is not in equilibrium. Therefore, the car will tilt toward the front, and then depending on its centre of mass, tip over and complete an entire flip. The time taken for an entire flip of the car will decrease as the car goes down the cliff due to the gravitational field strength and depending on the height of the drop, the car might land on its four wheels, or not.
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