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K^2
#3
Dec11-12, 03:58 AM
Sci Advisor
P: 2,470
Not necessarily. He said they are points on a line. So the interaction might be pair-wise. Think masses connected by springs, but with a different potential.

jbay, if you take them to be unit mass, yes, that's correct expression for kinetic energy. So if your potential energy is correct, then you have your Lagrangian.