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**Problem 2:**

A spring is stretched 10 mm by a 10 g mass. The mass is pulled an additional 6 mm and released. Determine the position \( u \) as a function of time. Write your solution in the form \( u(t) = R \cos(\omega t - \delta) \). (Ignore damping and \( g = 9.8 \, \text{m/s}^2 \)).

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