You have to make a rail track (with powered rails) put the mine cart on the rail and nudge it.
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I didn't make Minecraft.
You have to have a mod (modification) to make a cannon. It is not in vanilla minecraft.
how to make a fire works in minecraft 1.5.2
you can't make a pencil in minecraft, but there mite be a mod for it.
There is no rope in vanilla Minecraft.