The trigger mechanism is the simplest aspect of the problem.
For a floor target, a trebuchet or similar device is likely the best option. Are you being graded on accuracy, precision, both or neither?
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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