Question

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

Answer 1

please see attached file...

Answer 2

$\huge\red{heya!!!}$