A 32-lb weight is attached to the lower end of a coil spring suspended from the ceiling. The weight comes to rest in its equilibrium position, thereby stretching the spring 2 ft. THe weight is then pulled down 6 in below its equilibrium position, and released at time t = 0. No external forces are present, but the resistance of the medium in pounds is equal to 4y'(t), where y'(t) is the instantaneous velocity in ft/sec