The block is released from rest from the position in the picture and slides 6 meters down the frictionless incline. It strikes a spring that is at its natural length. Assume the spring is ideal and the mass of the spring is negligible.  Mass of block = 20kg Incline is 30 degrees above horizontal  spring constant = 200 N/m What is the max speed of the block? How far has the spring compressed when it reaches this max speed?

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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.