How do throttle control the speed car?

Throttle controls the speed of a car by regulating the amount of air and fuel mixture that enters the engine. When you press the accelerator pedal, it opens the throttle valve which allows more air and fuel to flow into the cylinders. This results in a faster combustion process, which in turn produces more power and increases the speed of the car. When you release the accelerator pedal, the throttle valve closes, restricting the flow of air and fuel into the cylinders. This slows down the combustion process and reduces the power output of the engine, causing the car to decelerate. The throttle valve is connected to the accelerator pedal through a series of mechanical or electronic linkages, and it is also controlled by the engine's computer to ensure optimal engine performance and fuel efficiency.