A metal block of base area
\(0.20 \,m^2\) is placed on a table, as shown in figure. A liquid film of thickness
\(0.25\, mm\) is inserted between the block and the table. The block is pushed by a horizontal force of 0.1 N and moves with a constant speed. If the viscosity of the liquid is
\(5.0×10^{−3}Pl\), the speed of block is ________
\(×10^{−3}m/s\)