Calculate velocity in a "simple electric train"

raymondd
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Homework Statement
How do you calculate the velocity of the battery with 2 magnets attached on polar ends moving in a coiled copper wire
Relevant Equations
unknown
How do you calculate the terminal velocity of the train moving in a coiled copper wire with two magnets attached to the polar ends?
I have attached someone else's work I've found on the internet here and need help 1662076917721.png1662076905411.png1662076725371.png
 
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