A falling tree (ENG/RUS)
A thin tall tree was cut and is now falling down. How does a tree trunk fall – as a straight line, with a concave up or with a concave down? Assume that the tree was cut completely and that air resistance is negligible.

Russian version:

Тонкое высокое дерево спилено под корень и падает. Куда прогибается ствол дерева во время падения: выпуклостью вниз или вверх? Сопротивлением воздуха для данной задачи можно пренебречь.

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