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A2=60 cm²=60:10.000=0,006 m²
F2=40.000 N
D2=F1
D3=p1=p2
F1/A1=F2/A2
F1/0,003×40.000/0,006
F1 ×0,006=40.000×0,003
F1×0,006=40×3
120/0,006 × 1000/1000
=120.000/6
=20.000 N