The situation is this: A truck is moving at 70mph with a ramp leading into it at the back. A car with front-wheel drive is behind it doing 75mph. The car goes up the ramp and into the truck. Here is where the dispute starts. My theory: Once the front wheels of the car are on the ramp the car's overall speed would then be accelerated because it has mounted a moving platform. Granted it wouldn't go to 175mph because of factors like wind resistance and the fact its going up a ramp but it would not be enough to completely kill the speed of the car at that speed and it would still increase considerably. This would result in the car going through the truck very quickly. My friend's theory: Once the car has mounted the ramp it would only be doing 5mph. He seems to think the truck's speed would be subtracted from the car's speed. His logic is "i saw it on Mythbusters but i cant explain anything errrrrrggggghhhhh". Please help me out.