Ответ:
p=f/s
f=mg
s=ab
p= mg/ab
1) F=mg
F=80*10
F=800
3)S=8
2,5=80*10/8b
20b=800
b= 40
2) s= 40*8
s= 320
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Ответ:
p=f/s
f=mg
s=ab
p= mg/ab
1) F=mg
F=80*10
F=800
3)S=8
2,5=80*10/8b
20b=800
b= 40
2) s= 40*8
s= 320