You place a crate of mass 48.5 kg on a frictionless 4.03-meter-long incline. You release the crate from rest, and it begins to slide down, eventually reaching the bottom 1.70 s after you released it. What is the angle of the incline?

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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.