A spring stretches 23.5 cm when a mass of 1.25 kg is attached to it in its rest position. Then, a mass of 1.75 kg is added to the first mass and the springs is released from its un-stretched position and allowed to oscillate. 1.) What is the spring constant of the spring? 2.) What is the frequency that the masses oscillate? 3.) What is the maximum displacement of the two masses when in equilibrium  4.) What is the energy stored in the spring when the masses reach their maximum displacement?

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