because of the cylinder compression
it depends what speed is fast and what speed is slow and what car you are talking about.
A siezed brakepad or shoe or the emergency brake is on.
nobody, they both used the same amount of gas.
Because of friction
fast
Are you going up a hill? Did you take your foot off the gas and is the compression of the engine slowing you down? Are your brakes sticking? Is your car getting the correct amount of air to fuel ratio? there are lots of reasons why a car would slow down while you're driving it. start with the easiest.
Either your gas pedal is stuck to the floor or you are going downhill.
windows down- more drag. It would take more gas to keep the car moving because the windows would slow the car down.
Assuming you are not pressing down on the gas, when you release the pedal, the car will slow down over time and evetualy come to a stop. Unless you are going down a hill, in which case you will speed up.
-- Its kinetic energy decreases. -- If the process continues, the car may stop altogether.
I know that whenever I get gas - I SLOW DOWN!
A car will move when the gas pedal is engaged. You can control the speed of the car by the pressure you put on the gas pedal. The brake pedal will either slow the car down or stop the car entirely.