(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

attached

2. Relevant equations

3. The attempt at a solution

I think i need to use energy methods for this because the acceleration is not constant..

trouble is I don't know the formula for the potential energy in cases like this.

Thanks for any help.

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# Homework Help: Mastering physics help - rail gun

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