363344 A bullet of mass \(0.1\;kg\) moving horizontally with speed \(400 \mathrm{~ms}^{-1}\) hits a wooden block of mass \(3.9\;kg\) kept on a horizontal rough surface. The bullet gets embedded into the block and moves \(20\;m\) before coming to rest. The coefficient of friction between the block and the surface is ____ .
363344 A bullet of mass \(0.1\;kg\) moving horizontally with speed \(400 \mathrm{~ms}^{-1}\) hits a wooden block of mass \(3.9\;kg\) kept on a horizontal rough surface. The bullet gets embedded into the block and moves \(20\;m\) before coming to rest. The coefficient of friction between the block and the surface is ____ .
363344 A bullet of mass \(0.1\;kg\) moving horizontally with speed \(400 \mathrm{~ms}^{-1}\) hits a wooden block of mass \(3.9\;kg\) kept on a horizontal rough surface. The bullet gets embedded into the block and moves \(20\;m\) before coming to rest. The coefficient of friction between the block and the surface is ____ .
363344 A bullet of mass \(0.1\;kg\) moving horizontally with speed \(400 \mathrm{~ms}^{-1}\) hits a wooden block of mass \(3.9\;kg\) kept on a horizontal rough surface. The bullet gets embedded into the block and moves \(20\;m\) before coming to rest. The coefficient of friction between the block and the surface is ____ .