Kinetic energy from potential energy graph for diatomic molecule

[PolyFX]

Homework Statement

The diagram below is a graph of potential energy vs. interatomic separation for a particular diatomic molecule (that is, a molecule consisting of two atoms).

For the energy level shown on the graph, imagine drawing a line whose length represents the kinetic energy when the interatomic separation is r0. This line runs from where to where?

Homework Equations

K+U=E?
0.5Ks^2=E

The Attempt at a Solution

I always have problems analyzing graphs. I got the latter parts of this question correct which involved doing calculations. However, I can't seem to get this one. The only reasonable answer I can come up with is from 1 to 2 since that would make the molecule unbound and allow it to separate (break apart). Any help on this question would be much appreciated.

 

[kuruman]

If you were to draw the total energy on the same graph as a function of r, what would it look like?