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F1 = 8 N
F2 = 4N
α = 120
ditanyakan :
R = ?
jawab:
R =√F1² + F2² + 2 F1 F2 cos α
R = √8²+4² + 2 (8)(4) cos 120
R = √64+16 + 2(8)(4)(-0,5)
R = √80 - 32
R = √48
R = 4√3 N