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F1 = 40N
F2 = 20N
θ = 120'
Dit IRI....?
IRI = √F1² + F2² + 2F1F2 cos θ
IRI = √40²+20² + 2.40.20 (-1/2)
IRI = √1600+400 + 1600 (-1/2)
IRI = √2000 + 800
IRI = √2800
IRI = 40√7