A block of mass M = 10kg is released from a height of h = 3m. It travels down a friction-less circular shaped ramp to the bottom where it encounters a rough horizontal surface. It travels over this surface for 6m followed by 3m more on a friction-less horizontal surface. At this point, the block compresses a spring by .3m before stopping. The spring constant is 2250 N/m. Find the coefficient of kinetic friction describing the interaction between the block and the rough surface.