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F1 = 8N
F2 = 4 N
α = 120
dit : R ?
dijawab :
R = √(F1²+F2² + 2F1F2Cosα)
= √(8²+4² + 2x8x4xcos 120)
= √(64+16 + 64x-1/2)
= √(80 - 32)
= √48
= 6,92 N