Constructing the shear diagram
Considering the segment
from x = 2 m to x = 4 m
area under shear
diagram = +31.20 kN-m
concentrated
moments = 0.00 kN-m
change in bending
moment = +31.20 kN-m
at x = 2 m, M = -8.00 kN-m
change in bending
moment = -31.20 kN-m
at x = 4 m, M = +23.20 kN-m