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F1 = F2 = 10 N
R = 10
dit : α ?
dijawab :
R = √(F1²+F2² +2xF1F2cosα)
R² = F1²+F2² +2xF1F2cosα
10² = 10²+10² + 2 x 10 x 10 cos α
100 = 100 + 100 + 200 cos α
100 = 200 + 200 cosα
-200cosα = 200 - 100
-200 cosα = 100
cos α = 100/-200
cos α = -1/2
α = 120°