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Q=mg
Q=400*10=4000N
F1/S1=F2/S2
4000/80=150/x
4000x=12000
x=3 cm^2
S1=?
m2=400kg
S2=80cm2
F=mg -> F2=m2*g=400*10=4000N
F1/S1=F2/S2 -> S1=S2*F1/F2
S1=80*150/4000
S1=3 cm2