Is Minecart motion preserved if a chunk is unloaded?
Solution 1:
According to my testing, minecraft momentum is preserved when a chunk is unloaded. EthosLab noted that minecart momentum is preserved in one of his videos, but I tested it myself just to make sure.
The minecart in this screenshot is moving counter-clockwise, and it has just enough momentum to reach the Powered Rail segment once completing the loop. If I quit and then restart Minecraft when the minecart is where it is in the screenshot (just after the Powered Rails), the minecart acts exactly as it would if I hadn't quit the game (it just reaches the Powered Rails).