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F1= 10 N
F2 = 6 N
α= 60
dit : R ?
dijawab :
R = √(10²+6²+2xF1F2cosα)
= √(100+36 +2 x 10x6xcos 60)
= √(136 +2x10x6x1/2)
= √196
= 14 N