please solve
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https://www.meritnation.com/ask-answer/question/a-block-of-mass-m1-is-pulled-with-a-string-of-mass-m2-and-le/physics/9360417
https://www.meritnation.com/ask-answer/question/a-block-of-mass-m1-is-pulled-with-a-string-of-mass-m2-and-le/physics/9360417