User talk:112.196.159.209

September 2020
Hello, I'm Jacob Gotts. I wanted to let you know that one or more of your recent contributions&#32;to Center-of-momentum frame have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Teahouse. Thanks. { $$\mathbb{JPG}$$ } 06:04, 24 September 2020 (UTC)
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