A spring with a mass of 4 kg has damping constant 28, and a force of 12 N is required to keep the spring stretched 0.5 m beyond its natural length.

A spring with a mass of 4 kg has damping constant 28, and a force of 12 N is required to keepthe spring stretched 0.5 m beyond its natural length. The spring is stretched 1 m beyond itsnatural length and then released with zero velocity. Find the position of the mass at any time tand mass that would produce critical damping