Решение задачи по физике раздел 50 пункт 9 волны

9. The car of mass m = 80 t has four springs. Rigidity k springs each spring is 500 kN / m. At what speed υ car starts to swing heavily as a result of shocks in the rail joints, rail if the length l is equal to 12.8 m?

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)