A cubical block (of side \( 2 \mathrm{~m} \) ) of mass \( 20 \mathrm{~kg} \) slides on inclined ...

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A cubical block (of side \( 2 \mathrm{~m} \) ) of mass \( 20 \mathrm{~kg} \) slides on inclined plane lubricated with the oil of viscosity \( \eta=10^{-1} \) poise with constant velocity of \( 10 \mathrm{~m} / \mathrm{s}\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \). The thickness of layer of liquid is \( \left(10^{-1}\right. \) poise \( \left.=10^{-2} \mathrm{~N} \mathrm{~s} \mathrm{~m}^{2}\right) \)
(1) \( 2.5 \mathrm{~mm} \)
(2) \( 4 \mathrm{~mm} \)
(3) \( 6 \mathrm{~mm} \)
(4) \( 5.5 \mathrm{~mm} \)
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