Ah, making a TNT cannon in minecraft can be a fun project! Start by creating a platform with a long row of blocks. Place a dispenser at one end and load it with TNT. Then, use redstone to connect a button or lever to the dispenser. When you activate the redstone, the TNT will launch from the dispenser like a cannonball! Remember to experiment and have fun with different designs to see what works best for you. Happy crafting!
I personally have found a fun little way to make a cannon in creative mode. You make a hollow tube with a bottom made out of obsidian or bedrock, and put TNT at the bottom and sand at the top. When you activate the TNT, the sand will shoot out.
You have to have a mod (modification) to make a cannon. It is not in vanilla minecraft.
I assume you mean TNT. All you have to do is hit it.
you need to be in multi-player or a server to make the TNT work.
To make TNT, place 5 gunpowder and 4 sand
redstone torch
The ID (code) for TNT in Minecraft is 46.
place a 3 by 3 square of tnt and replace the middle one with water. add another ring of any block around the tnt. Place redstone on top of that ring of blocks. To launch, stand in the water and power the redstone.
5 Gunpowder and 4 Sand
Idgaf
You can set TNT off in Minecraft Beta by clicking it, or by triggering it with redstone.
The number ID for TNT is; 46.