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# Unit 11: Why you cannot change the result of a tug of war on ice!

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- Find the approximate location of the centre of mass (without calculations)Get 3 of 4 questions to level up!
- Center of mass of two particlesGet 3 of 4 questions to level up!

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### Practice

- Predicting motion using the center of mass Get 3 of 4 questions to level up!

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