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Need to create a Golf Ball Launcher that will launch a ball fifty yards, but I can not solve?

I can not use air power but apart from that the options are open. I spent all day trying to get it working, but I'll try anything. Can someone send me plans for a catapult or something to do the job!? Thanks. No, I can not use air power or any type of flame. Sorry, I forgot to mention that.

I do not know nothing about these things. Sorry.