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A container filled with viscous liquid i...


A container filled with viscous liquid is moving vertically downwards with constant speed `3v_0`. At the instant shown, a sphere of radius `r` is moving vertically downwards (in liquid) has speed `v_0`. The coefficient of viscosity is `eta`. There is no relative motion between the liquid and the container. Then at the shoen instant, The magnitude of viscous force acting on sphere is

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