A 2.0-kg block of wood is attached to a horizontal spring that is at its equilibrium length (not stretched or compressed) and that has a spring constant of 1000 N/m. A bullet with a mass of 10 g is shot into the block with a speed of 450 m/s. The bullet remains lodged in the block of wood, which slides along a frictionless horizontal surface. By how much is the spring compressed by the block plus bullet system?

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Q: equilibrium displacement

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.