k = Fупр/l
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k = 10/0,02 = 500 Н/м
k = 20/0,04 = 500 H/м
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k = Fупр/l
—————————
k = 10/0,02 = 500 Н/м
k = 20/0,04 = 500 H/м
Ответ: 500 Н/м