Since the vehicle is moving up the incline and gravity only pulls straight down, there is a component of this force that pulls in the opposite direction as the velocity to make the vehicle slow down. As it moves up the incline, there is an increase in gravitational potential energy. The higher it goes, the greater the potential energy.
Let's say they are in fourth gear moving along at 40 miles per hour. If they shift down to third gear and take their foot off the gas pedal, the car will slow down. They don't have to touch the brake pedal, which means that the car's brake lights won't come on even though it is slowing down. Of course, if a driver needs to stop in a very short distance, this downshifting isn't going to be enough, and they are going to have to use traditional braking.
What if you remove the spark and the fuel? If the wheels are engaged with the engine through the transmission, there's still the compression of a gas in the cylinders. This compression of a gas adds resistance to the rotating engine and can be used to slow down the car.
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