A very small ball of radius r and mass m is released in a large tank having a liquid of density $ρ$ and moving with an acceleration a as shown in figure. If coefficient of viscosity the liquid is $η$ , then terminal speed of the ball with respect to container will be (neglect buoyant force)

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Buoyancy is neglected. At terminal speed, net force is zero. f g ​ = f v ​ m g 2 + a 2 ​ = 6 π ηr v v = 6 π rη m g 2 + a 2 ​ ​

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