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TopNewestIn future, please report problems directly instead of posting a note.

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well, i didnt know if i was wrong or not so i thought it best to ask

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it's feel the gravity and not face the gravity ! , your dr/dt expression is wrong see my solution there ! https://brilliant.org/problems/feel-the-gravity/?from_notification=9562879#!/dispute-comments/17819/51814

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my expression is the same as yours

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yes i did't see it clearly at first , maybe you are taking some approximations !

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