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Va=50m/s
Vb=40m/s
ρ=1,29kg/m^3
m=....
jb:w=1/2ρ(va^2 - vb^2)A
=1/2*1,29(25^2 - 40^2)18
=1,29(2500 - 1600)9
=1,29(900)9
= 10449 N