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f1=16 N ke kanan
f2=40 N ke kanan
f3=24 N ke kiri
f4=56 N ke kiri
dit : ΣF ?
dijwab :
ΣF = F ke kiri - F ke kanan
= (24+56) - (16+40)
= 80 - 56
= 24 N ke arah kiri