A 10 kg block is released from the top of a curved ramp of height 4 m. The track is frictionless except for a rough portion with a length of 8 m. The block travels down the track, hits a spring of force constant 200 N/m, and compresses the spring 0.4 m from its equilibrium position before coming to rest momentarily. Determine the coefficient of kinetic friction between the block and the rough surface.

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