A 2-kg box, moving along a horizontal frictionless surface, hits a spring (k = 5200 N/m) on the other end at a speed of 10 m/s. How long the spring is compressed when the box brought to rest?

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Q: spring constant in N/m

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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.