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Aplicamos torque :
∑Mo = 0 (en el punto A)
Rb x 4m - 400Nx2m = 0
Rb = 200N
Luego segunda ley de Newton en el eje y
∑Fy = 0
∑Fy = Ra + Rb - 400N = 0
Ra = 400N - Rb
Ra = 400N - 200N
Ra = 200N