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F1 = 5 N
F2 = 12 N
membentuk sudut 60°
Ditanya : Resultan (R) ?
Penyelesaian :
R = √(F1² + F1² + 2 . F1 . F2 . cos 60°)
R = √(5² + 12² + 2 . 5 . 12 . 1/2)
R = √(169 + 60)
R = √229 N