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F1 = 20 (kanan)
F2 = 10 N (kanan)
F3 = 30 N (Kiri)
dit : R dan arah ?
dijwab :
R = F ke kanan - F ke kiri
= (20+10) - (30)
= 30 - 30
= 0 N
krn resultan 0, maka benda tdk bergerak.atau diam di tempat..