Abstract
This present study considers a body that is divided into rigid zones which interface one another on surfaces of velocity discontinuity and have motions relative to one another on these planes. The study determines the surfaces of velocity discontinuity according to the relative motions of two neighboring rigid zones. It also proves analytically that the solutions given by the force-balance method and by the upper-bound approach to the power based on a kinematically admissible velocity field are identical. They are identical in concept, not two different approaches.
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