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= PQ / QR
= 160 / 40
= 4
F = W . QR ÷ PQ
F = 50 . 40 ÷ 160
F = 1.25 N
LF=160+40=200
LW=40
W=m.g(gravitasi bumi)
50.10=500
KM=LF/LW=200/40=5
F=W/KM=500/5=100N