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Sorry, but the physics of gquarks and gluons is considerably more
complicated than that. I don't want to get into great detail, ut the
notion "kinetic energy of a quark or gluon inside a proton" may not have
much meaning. The trouble is that neither a quark nor gluon has any
existence outside of a proton (or other hadron) so the notion of mass is
hard to pin down. (For ordinary particles we make our mass determinations
- physically and conceptually - in terms of the isolated particle). There
is no such thing as an isolated quark or gluon.
The "glue" that holds a quark inside a proton is not very
stretcheable. Think of the quark as moving at times to the boundary of
the proton and stretching the "glue". When this happens, the energy is in
the stretch. So a model of what is going on is a harmonic oscillator that
is continuosly transferring its energy back and forth between kinetic and
potential.