4. (20 points) A 1 kg weight is hung on the end of a vertically suspended spring, thereby stretching the spring L-10 cm. The weight is raised 5 cm above its equilibrium position and released from rest at time t-0. Dumping factor of the environment is d 30, and initial speed is 0. Find the displacement x of the weight from its equilibrium position at time t Use g-10m/s2 x-0 Positive Direction