User talk:202.131.156.249

December 2018
Hello, I'm Balkywrest. I wanted to let you know that one or more of your recent contributions to Effective mass (spring–mass system) 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 Help Desk. Thanks. Balkywrest (talk) 13:08, 28 December 2018 (UTC)
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