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im getting 197.694 how did u calculate 0.210

Hi mr.robmulero, a coefficient of friction is usually less than one, and never significantly more than one. The only way to get more than one is if there's some kind of sticky glue between the surfaces to make friction more than the normal force. In any case your answer of 197.694 isn't what is expected for a coefficient of friction. As for how I calculated 0.210, I'm not really sure what precisely your question is, so if you can be more specific I might be able to help. Have you tried putting the last formula in the video into your calculator?

All the best,
Mr. Dychko