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A catapult is a mechanical device that can be used to project a projectile. There are several different designs. The device is "charged" by either stretching an elastic material or by putting a beam under a bending tension. This stores up potential energy in the machine. The catapult is then fired by releasing this energy instantly. The mathematical required are:
- calculation of tension in the elastic band or bent beam,
- impulse imparted to the projectile,
- trajectory of projectile travelling under the influence of the force of gravity.
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