A bullet (W1 = 2.5 oz) with a is fired horizontally with a velocity v1 = 1675 ft/sec into the block (W2 = 6.1 lb) of soft wood initially at rest on the horizontal surface. The bullet emerges from the block with the velocity v2 = 1195 ft/sec, and the block is observed to slide a distance of d = 8.9 ft before coming to rest. Determine the coefficient of kinetic friction μk between the block and the supporting surface.