A block of mass m = 2.8 kg is dropped (starting from rest) from a height h = 0.81 meters above the top of an ideal spring with a spring constant of k = 226 newtons per meter. The spring is originally at its equilibrium length (and the mass of the spring is negligible). The block falls on the top of the spring and compresses it a distance d from its equilibrium length before the spring sends it flying back up into the air. Ignore friction and other non-conservative forces, and let g = 9.8 meters per second squared. What is the maximum compression d of the spring (in units of meters)?

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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.