$${\begin{align*} p_{fA,y} &= 0, \\ p_{fB,y} &= -0,20Mv_{fB,y}= -0,20 Mv_{fB} \sin 50^\circ, \\ p_{fC,y} &= 0,30 Mv_{fC,y}= 0,20 Mv_{fC} \sin 80^\circ\end{align*}}$$