Shoot Balls at Extreme Speeds: the Gauss Rifle! / Mr. Denjiro's Happy Energy!

DENJIRO: Today, I’ll show you an interesting phenomenon using steel balls. I have steel balls lined up on this rail here. Let me slowly knock the balls with this other ball.
GIRL: That ball flew away so fast!
DENJIRO: Very fast indeed. Actually, the two balls that collided were neodymium magnets. These two balls right here.
NARRATOR: If you collide plain steel balls, the one on the end doesn’t fly away. So why does the ball fly away if you use magnets?
DENJIRO: When the neodymium I rolled approaches the other neodymium magnet, it quickly accelerates due to the strong magnetic force and collides with the other ball. This energy is transferred to the ball at the end, and that’s why it flew away. This setup is known as a “Gauss rifle” or a “Gauss accelerator.”
Now, how can we launch the ball at an even higher speed? This time, I have three groups of five balls. Only the ball at the very back of the groups are neodymium magnets. Now, let me try it out. The ball moved even faster. Since the balls are accelerated three times, the ball that was launched was even faster.
Let’s try out another idea to make the ball go even faster. Take a look at this. Metal balls are lined up so they gradually become smaller. The ball at the very back is a neodymium magnet. Let’s try it out.
BOY: It’s so fast you can barely see it without slow motion.
DENJIRO: You can see that it’s buried in the clay wall. By making the balls gradually get smaller, the energy is transferred efficiently. Since the ball at the end is light, it gets launched at a very high speed.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"