일반물리학 1 — Potential Energy and Conservation of Energy: Problem 56

56 You push a 2.0 kg block against a horizontal spring, compressing the spring by 12 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 75 cm from where you released it. The spring constant is 170 N/m. What is the block–table coefficient of kinetic friction?