Im new to the game development with as3. i want to make side scroller race game with hills and terrain. im curious where i can learn how to make the car drive over the terrain rather than through it. help please!
One way to do a side-scroll terrain game would be with a physics engine. Box2d is a widely used one ported to AS3, and there are examples of similar projects:
Box2d isn't all that easy to work with, though. Another approach would be to have just 45 degree angles and flats for terrain - simple enough to calculate car speed without the physics engine.
I've attached a simple example of a character moving over uneven terrain. It may not be exactly what you're looking for, but may give you a place to start.