A cubical block of side 10sqrt(10) cm is...

A cubical block of side `10sqrt(10)` cm is connected to a smooth and uniform disc of mass `20g` through an ideal string as shown. The block is placed on a thin liquid layer of thickness `0.2` mm. if center of the disc move downward with constant speed of `2cm//sec` after the system is released. If coefficient of viscosity of liquid is `x/1000` Pa-sec. then find `x` (Take `g=10m//s^(2)`)

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