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F1 = 6 N
F2 = 6 N
α = 120
dit R ?
dijawab :
R = √(F1²+F2² + 2F1F2cos 120)
= √(6²+6² +2x6x6x -1/2)
= √36+36 -36
= √36
= 6 N
ARAH Vektor :
Sin β = F2/R Sinα
= 6/6 sin 120
= 1/2√3