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50 cm= 5×10^-1 meter
Rumusnya=
W.lb=F.lk
900.(5×10^-1)=F.150/100
F= 9×(5×10^-1)/150, karena 15×10^1 naik ke atas jadi
F =9x(5×10^-1-1)/15
F = 3×10^-2 N
Maaf, klk salah