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F1 = 20 N
F2 = 8 N
α = 60
dit : R ?
dijawab :
R = √(F1²+F2² +2xF1F2xcosα)
= √(6²+8²+2x6x8xcosα)
= √(36+64+2x6x8x1/2)
= √(100+48)
= √148
= 12,16 N