In optimal conditions such as infinite runway, performed in a vacuum, with a constant gravitational pull and a zero friction ramp the car could travel at the speed of light.
For anything else it would depend on the ramp and the car. Also at what point you stop calling a ramp a ramp and start calling it a drop.
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The larger the angle of the ramp, the faster the car will go down it.
If you are talking about a car rolling down a ramp then yes. The taller the ramp the more momentum the car will create there for the car will travel farther and faster.
Changing the slope of the ramp will affect the speed of the vehicle going down it.
it all depends on the height of either the ramp or how far up the ramp the toy car rolls from
A plastic toy car