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7. (25 pts.) Determining Mass A spring oscillates with a period of 2.00 s when a block of mass m is attached to it and the other end is attached to a large, immovable object. When the mass is increased by 2.00 kg, the period of oscillation is 3.00 s. Determine the mass m. Assume that friction and air resistance are negligible and that the mass moves on a flat, horizontal surface.

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