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F1 = 10 N
F2 = 5 N
α = 60°
dit : R ?
dijawab :
R² = F1²+F2² + 2F1.F2cosα
R² = 10² + 5² + 2x10x5xcos 60
R² = 100 + 25 + 2x10x5x0,5
R² = 100 + 25 + 50
R = √175