An animal with a mass of 25 kg starts to slide while standing on the top of a 10 m high pole as shown in the figure, and its speed becomes 4 m / s when it reaches the bottom of the pole. What is the friction force applied by the pole affecting the animal? (g = 10 m / s ^ 2)

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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.