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p=F/s
F= 3N
a= 5cm= 0,5dm= 0,05m
b=10cm= 1dm= 0,1m
s= 0,05* 0,1=0,005m²
p= 3/ 0,005= 600Pa
b.
p= F/s
F= 3N
a= 10cm= 1dm= 0,1m
b= 15cm= 1,5dm= 0,15m
s= 0,1* 0,15= 0,015m²
p= 3/ 0,015= 200Pa
c.
p=F/s
F=3N
a= 5cm= 0,5dm= 0,05m
b= 15cm= 1,5dm= 0,15m
s= 0.05* 0,15= 0,0075m²
p= 3/ 0,0075= 400Pa