A 16​-lb weight stretches a spring 16 ft. The​ spring-masssystem is in a medium with a damping constant of 1.5 ​lb-sec/ft,and an external force given by
f (t)= 3+e^-3t ​(in pounds) is being applied. What is thesolution function describing the position of the mass at any timeof the mass is released from
1ft below the equilibrium position with an initial velocity of 2​ft/sec downward?
