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F1 = 9 N
F2 = 24 N
α = 60
ditanyakan :
F2-F1 = ?
jawab :
F2-F1 = √F1²+F2² - 2F1 F2 cosα
F2-F1 = √9²+24² - 2 (9)(24) cos 60
F2-F1 = √81 + 576 - 216
F2-F1 = √441 = 21 N