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F1 = 30 N, F2 = 40 N
α = 60°
R = __?
Cara formal
R = √(F1² + F2² + 2 F1 F2 cos 60°)
R = (30² + 40² + 2 • 30 • 40 • (½))
R = √(900 + 1600 + 1200)
R = √3700 = 10√37 N ← jwb