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70-120
-50 newton ke kanan
atau 50 newton kekirii
di tarik ke KANAN dngn gaya = 30 N dan 40 N
ditarik ke KIRI = 50 N dan 70 N
dit : R ?
dijawab :
R = F ke kiri - F ke kanan
= (50+70) - (30+40)
= 120 - 70
= 50 N ke arah kiri