The car goes down the mountain with the engine off. With what energy does it move?

Being on a mountain, that is, at a certain height from the earth’s surface, the car has potential energy (Ep = m * g * h). The higher the car is from the earth’s surface, the more potential energy it has. After the brakes are released, the car begins to move downward under the action of gravity, and the potential energy is converted into kinetic energy (Eк = m * V ^ 2/2).

From this we can conclude: the movement of the car occurs due to the transformation of potential energy into kinetic energy under the action of gravity.