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F1 = F1 = 10 N
α = 60
ditanyakn : R ?
dijawab :
R = √(F1²+F2²+ 2x F1F2xcos α)
= √(10²+10²+2x10x10xcos 60)
= √(100 + 100 + 2 x 200 x 1/2)
= √(200 + 200)
= √400
= 20 N