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calculate the viscous force acting on a rain drop of radius 5x10^(-4)m falling with a uniform velocity 2m/s through air. The coefficient of viscosity of air is 1.8times10^(-5)Ns/m2 a. 5.25x10^(-7)N b. 3.393x10^(-7)N c. 2x10^(-7)N d. 10x10^(-7)N

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