bantu jawab soalnya kak

F2 dan F3 sama besar dan mengapit sudut 120° menghasilkan resultan R1 = 12 N ke arah sb x+
R1 dan F2 berlawanan arah, menghasilkan resultan R = 6 N ← jwb

[tex]\displaystyle F_1=F_3=12\,\text{N}\\F_2=-6\,\text{N}\\\theta=120^\circ\\\\R=?\\\\|F_1^2+F_3^2|=\sqrt{|F_1|^2+|F_3|^2+2F_1F_3\cos\theta}\\|F_1^2+F_3^2|=\sqrt{12^2+12^2+2\cdot12\cdot12\cos120^\circ}\\|F_1^2+F_3^2|=\sqrt{12^2+12^2-12^2}\\|F_1^2+F_3^2|=\sqrt{12^2}\\|F_1^2+F_3^2|=12\,\text{N}\\\\R=F_2+|F_1^2+F_3^2|\\R=-6+12\\\boxed{\boxed{R=6\,\text{N}}}[/tex]