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ΣFx = F1+F2+F3
sin α = 4/5 maka cos α = 3/5 (buat segitiga)
F1 = 100
F2 = cos α x 50 = 3/5 x 50 = 30 ke arah kiri
F3 = cos α x 50 = 3/5 x 50 = 30 ke arah kiri
karena F2 dan F3 ke arah kiri maka negatif
ΣFx = F1+F2+F3 = 100 - 30 - 30 =40
ΣF = √ΣFx+ΣFy = √40+0 = 20