At least it doesn’t look like chocolate stuff, always great to get those turning white because they baked in mid summer heat.

How steep of a downhill and how fast are you going? Gravity will pull depending on the angle of the hill, wind resistance increases with the square of your speed. There will always be a speed where the force pulling you down/forwards will be the same as the force slowing you down due to wind resistance. If you go slower, your car will speed up towards that speed, if you are already faster, it will naturally slow down with no input from the engine or your brakes.

Sure it does.