If there is a hill, it will move more slowly. It will continue moving at the same speed if the surface is flat. Gravity is what causes a slope’s change in speed.
Things move more quickly when moving downhill and more slowly when moving upwards (slow down).
Yes, many individuals initially find this counter-intuitive because they overlook the fact that acceleration can still occur even when an object maintains a constant speed.
The force that is sent up the hill is powered by the car’s engine. Because the engine makes the drive wheels rotate, the road applies this force, which is actually static friction, to the drive wheels.
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