I had the same assignment for my physics class, and we used a trebuchet design and had no problems getting distance once we had established baseline counterweight distances. PM me if you want to see the plans we used- it might give you some ideas.
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Calling from deep in the heart, from where the eyes can't see and the ears can't hear, from where the mountain trails end and only love can go... ~~~ Three Rivers Hare Krishna
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