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4. https://www.meritnation.com/ask-answer/question/water-sprinkler-used-for-grass-lawns-begins-to-rotate-as-soo/science/9460317 

7. 
https://www.meritnation.com/ask-answer/question/how-can-first-and-third-law-of-motion-be-derived-from-sec/laws-of-motion/16971 

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