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ingat yang sudutnya nempel di kali " cos "
sumbu x
Fx= F1-F2-F3 sin30
Fx= 80-30-50 sin30 = 25 N
sumbu y
Fy= F3 cos 30
Fy= 50 cos 30
Fy= 25akr 3 N
karena tegak lurus maka rusltan gayanya
F= akr Fx^2+Fy^2
F= akr 25^2+25 akr 3^2
F= akr 625+ 1875
F= akr 2500
F= 50 N