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(((2*20kg*9.81m/s/s)/(1.225kg/m^3*pi*(40cm)^2*0.4))^1/2*60s)/(pi*80cm)
(((2*20kg*9.81m/s/s)/(1.225kg/m^3*pi*(40cm)^2*0.4))^1/2*60s)/(pi*80cm)
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