Rail Gun

• Demo is very reminiscent of Newton's Cradle, but with one cool trick. Roll one ball down the ramp, and, upon colliding with two or more others, one ball rolls up the other side to about the same height as the original.
• But if a special ball is rolled down (of identical weight, but possesing one unique property) the outgoing ball does more than merely roll up to the starting height of the original- it shoots entirely off the track. See video at this link- http://www.arborsci.com/magnetic-accelerator. Can you explain it?
• Located in L02, section B-5

• Special ball is magnetic.