Damping of a Spring System

A 2kg2 \text{kg} mass attached to a spring of spring constant k=10 N/mk = 10 \text{ N}/\text{m} oscillates through a fluid that exerts a damping force Fd=(4 Ns/m)vF_d = -(4 \text{ N}\cdot\text{s}/\text{m})\: v on the mass, where vv is the velocity of the mass. Which of the following correctly describes the oscillatory behavior of the system?

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