From the equilibrium of vertical forces,
RA = 2 kN
Shear Force on the Beam
At point A, (SF)A = +2 kN
At point B, (SF)B = +2 kN
A downward 2 kN at point B so SFD sudden drawdown 2 kN.
Shear force in portion BC = 0
Shear Force Diagram (S.F.D.)
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