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A spring-powered gun shoots ping-pong balls against a styrofoam ball.
The styrofoam ball is supported by an electromagnet, which is disactivated in the moment that the projectile leaves the gun.
Thus, it is possible to verify that, provided that the gun aims initially at the styrofoam ball, the projectile always hits the styrofoam ball regardless of how far away it is.
Teaching guide included.
