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    How do I answer this?: a volcano erupts, spewing out 1000000000 rocks on average mass 1kg in a northerly direction. Assuming these rock fragments all go in the same direction, what recoil motion does the mountain, which has a mass of 1000000000 tonnes, experience? The average speed of rock fragments is 200 m/s and 1000 kg = 1 tonne.


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