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A 0.2 Kg mass is connected to an ideal spring and is free to oscillate on...

A 0.2 Kg mass is connected to an ideal spring and is free to oscillate on a frictionless horizontal plane. The mass is displaced by 0.3 m from the equilibrium position and then released with no initial speed. When the mass is 0.1 m from the equilibrium position, its speed is 2 m/s. Calculate the elastic constant K of the spring.

Please solve it using the formula below

Ui + Ki = Uf + Kf

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