Meriam, Kraige & Bolton — Kinetics of Particles: Problem 3_143

3/143 A 2-oz bullet is fired horizontally with a velocity \(v_1 = 1800 \text{ ft/sec}\) into the 6-lb block of soft wood initially at rest on the horizontal surface. The bullet emerges from the block with the velocity \(v_2 = 1200 \text{ ft/sec}\), and the block is observed to slide a distance of 8 ft before coming to rest. Determine the coefficient of kinetic friction \(\mu_k\) between the block and the supporting surface.