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F1 = 3 N
F2 = 4 N
α = 60
dit : R ?
dijawab :
R = √(F1²+F2² + 2F1F2x cosα)
= √(3²+4² + 2x3x4x cos 60)
= √(9 + 16 + 2 x 3 x 4 x 1/2)
= √(25 + 12)
= √37
= 6,08 N