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

https://www.youtube.com/watch?v=4zb0t4H0Kec

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The problem is EXACTLY the same.

But one thing concerns me. The answer key said the force is [tex]-27\mu N \hat{i}[/tex]

From Walter Lewin's method, I got [tex]+27\mu N \hat{i}[/tex]. Help?

3. The attempt at a solution

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# Question about this problem and Walter Lewin's video

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