How to Build a Popsicle Catapult

How to Build a Popsicle Catapult
  TSRAA
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I had a science project with a few friends to build this small tabletop catapult, I got a bit carried away. If you pull the catapult back far enough, the object that you fling (possibly a ping pong ball) will go very far and if you aim at somebody's head

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