August 2021 0 8 Report
Пружину детского пистолета сжимают: в первом случае силой F1= 2 H на 4 см, во втором - неизвестной силой - на 2 см. Отношение потенциальных энергий Еп1/Еп2, приобретённых пружиной в обоих случаях составляет.... 1) 1/1  2) 1/2 3) 2/1 4) 1/4 5) 4/1 

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