Calculating Elastic Potential Energy in a Vertical Spring System

[iceT]

1.60 kg object is hanging from the end of a vertical spring. The spring constant is 48.0 N/m. The object is pulled 0.200 m downward and released from rest. Complete the table below by calculating the translational kinetic energy, the gravitational potential energy, the elastic potential energy, and the total mechanical energy E for each of the vertical positions indicated. The vertical positions h indicate distances above the point of release, where h = 0.

h (m)
0.0
0.200
0.400


ok..i got no problem with the translational kinetic energy, the gravitational potential energy and the total mechanical energy E...but I am confused about the elastic potential energy...i know its PE= 1/2KX^2
but how can i find X

 

[Integral]

x would be the distance from the equiblrium position.

 

[Da-Force]

X = the distance the mass stretches the spring from the springs original position (no mass pulling on it)