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F1 = 15 N
F2 = 15 N
R = 15√3 N
ditanyakan :
α = ?
jawab :
R² = F1² + F2² + 2F1F2cosα
(15√3)² = 15² + 15² + 2 (15)(15) cos α
675 = 225 + 225 + 450 cos α
450 = 450 cos α
1 = cos α
cos α = cos 0
α = 0