Лаг1989 задача №3.18

A body of mass m = 500 g, attached to a rubber cord with a length of L₀ = 9.5 cm, is deflected at an angle of 90 ° and released. The stiffness coefficient of the rubber cord is k = 9.8N / cm. Find the length L of the rubber cord when the body passes the equilibrium position.

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