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https://jjthetutor.com/7-24-a-2-50-kg-block-on-a-horizontal-floor-is-attached-to-ahorizontal-spring-that-is-initially-compressed-0-0300-m-thespring-has-force-constant-840-nm-the-coefficient-of-kineticfriction-betwe/
7.24 .. A 2.50-kg block on a horizontal floor is attached to ahorizontal spring that is initially compressed 0.0300 m. Thespring has force constant 840 N>m. The coefficient of kineticfriction between the floor and the block is mk = 0.40. The blockand spring are released from rest and the block slides along thefloor. What is the speed of the block when it has moved a distanceof 0.0200 m from its initial position? (At this point the spring iscompressed 0.0100 m.)