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A= 80 m²
Vₐ= 340 m/s
Vb= 290 m/s
ρ udara= 1,2 kg/m³
ditanya
F=...?
jawab
F= 1/2.ρ.(Va² - Vb²).A
F= 1/2(1,2)(340² - 290²)(80)
F= (1,2)(115.600 - 84.100)(40)
F= (1,2)(31.500)(40)
F= 1.512.000 N
F= 1.512 kN