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F1 = 50 N ( arah ke kanan )
F2 = -15 N ( arah ke kiri )
F3 = -20 N ( arah ke kiri )
Dit: perpaduan gaya (Resulta)...?
R = F1 + F2 + F3
R = 50 + (-15) + (-20)
R = 50 - 15 - 20
R = 15 N ( ke arah kanan) --> searah F1