Taking moments about P gives the right reaction(10×2+20×4)/6=16.667 kN, so the left reaction is13.333 kN. Shear is13.333 before Q,3.333 between Q and R, and−16.667 after R. Its sign-changing jump crosses zero at R, C. With ideal point loads this is a discontinuous crossing, not a finite interval of zero shear.
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