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Keuntungan mekanis =berat : gaya
4 = berat : 900
Berat = 900 × 4
Berat = 3600 n
Ketinggian bukit =
Jarak : ketinggian = berat : gaya
50 m : ketinggian = 3600 : 900
50 m : ketinggian = 4
Ketinggian = 50 × 4
Ketinggian = 200 m