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Magnetic Velocity

How would I figure out the velocity of a ball at the end of the chain.
For example if I had 4 half inch magnets each one 6 inches apart with 3 quarter inch steel ball behind each magnet.
If the starting velocity of the first ball to hit the magnet is 10mph.
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What if i changed the ball size half way through.
For example if I had 4 half inch magnets each one 6 inches apart with 3 1/4 inch steel ball behind the first two magnets and 3 1/8 inch steel ball behind the last 2 balls
Example video to help understand setup
https://www.youtube.com/watch?v=9LtkIcAIQII

 

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