Ответ:
P=F/S
S=ab
F=mg
P=mg/ab
P= 40*10/1,2*9
P= 400/10,8=80/2,16=10/0,27
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Ответ:
P=F/S
S=ab
F=mg
P=mg/ab
P= 40*10/1,2*9
P= 400/10,8=80/2,16=10/0,27