Is it possible to kill an Iron Golem? I have tried to hit it with my diamond sword but that failed. If you can kill them please tell me how to. And what materials are needed to kill the Iron Golems. Also what loot will it give you?
They have a lot of hitpoints, it'll take more than a few swings to hit them, but they do go down eventually.
A better method to kill them would be to suffocate them using Sand or Gravel. They cannot drown and take no damage from falling, meaning any trap will have to use Suffocation to kill them.
When killed, they drop Iron Ingots and Poppies.
Yes, it has 100 health points though. Try to get it aggroed by night time mobs so that they will attack it for you.
If you kill it, it will drop iron ignots and poppy. Read more about them Iron Golem Minecraft Wiki