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Kinetic energy of a system of two atoms from a graph of their potential energy curve

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Homework Statement



The figure shows a potential energy curve for the interaction of two neutral atoms. The two-atom system is in a vibrational state indicated by the heavy solid horizontal line.

(a) At r = r1, what are the approximate values of the kinetic energy K, the potential energy U, and the quantity K+U?
K =
U = -1.3 eV
K+U =

Homework Equations


U=0.5*Ks^2

The Attempt at a Solution


I can't for the life of me figure out how to find K, I feel like it should be really easy, but I'm at a loss of where to start.

If anyone could give me jumping off point at least I'd be very grateful. Thanks
 

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Answers and Replies

  • #2
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After taking a short break, I figured it out, and it was massively simple.
I'll post the answer here so that anyone else Googling in the future can find it.

K=1.1
U=-1.3
and K+U = -0.2

since they are inversely proportional, their sum must equal the vibration state.
 

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