A container filled with viscous liquid is moving vertically downwards with constant speed 3v0. At the instant shown, a sphere of radius r is moving vertically downwards (in liquid) has speed v0. The coefficient of viscosity is . There is no relative motion between the liquid and the container. Then at the shown instant, the magnitude of viscous force acting on sphere is
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The answer is that I don't know it because I am just in class 6
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