Aspring is stretched 10 cm by a force of 3 n. a mass of 2 kg is hung from the spring and is also attached to a viscous damper that exerts a force of 3 n when the velocity of the mass is 5 m/s. if the mass is pulled down 5 cm below its equilibrium position and given an initial downward velocity of 10 cm/s, determine its position u at any time t. find the quasi-frequency î¼ and the ratio of î¼ to the natural frequency of the corresponding undamped motion.