A magnetic cannon consists of a line of steel balls which are in contact with a permanent magnet. If another steel ball collides with the system on one side. then the ball at the other end of the line is ejected at high speed. A theoretical model is proposed for the system by neglecting energy losses and making the approximation that the magnetic field is uniform near each ball. https://www.pomyslnaszycie.com/white-and-green-bulletin-board-border-simply-boho-schoolgirl-style-on-sale/