What Animation vs Physics Got Wrong.

Animation vs. Physics by Alan Becker is truly a masterpiece. However, I think some of the scene is inacurate. Especially about conservation of momentum and magnetic slingshot. Please feel free to correct me if I'm wrong. I really like Animation vs Physics, but I found this part is a bit confuse me, so I make this video in hope that someone can help me to clarify that. All credits to Alan Becker. Original video:    • Animation vs. Physics   Music: Animation vs. Math    • Animation vs. Math