How Much Does It Slide?

A bullet of mass 0.02 kg travelling horizontally with velocity 250 m/s strikes a block of wood of mass 0.23 kg which rests on a rough horizontal surface. After the impact, the block and bullet move together and come to rest after travelling a distance of 40 m. What is the coefficient of sliding friction of the rough surface ????? (g = 9.8 m/s )

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