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Jan 7, 2014 at 17:50 comment added Ján Lalinský It should be said that $K$ is the kinetic energy of the constituents of the system, not of the system's center of mass. Similarly, $U$ is total potential energy of the constituents of the system, not potential energy of the system in some external field.
Jan 7, 2014 at 14:14 history answered Gokotai CC BY-SA 3.0