An Athlete pulls a 20 kilograms crate along Lane A of the storage house. Lane A is a 15m  aisle. Using the yellow rope, he exerted an 80N force 15 degrees above the horizontal. suppose the athelete met his coach at the end of the aisle and he added 5kg item on the crate and instructed him to bring the item to next aisle (Lane B) which was also 15m long. Starting from rest, beginning in Lane B,  the athelet pulls the crate with 95N force 15 degrees above horizontal using the rope. The athelete reaches the end of the row of Lane B  at 2.5 meters per second.  Question: How much work is done by the Athelete? What is his change in the kinetic energy of the crate at the end of Lane B? Lastly, how large is the average friction force that had acted on the crate? Please show solution or formula used. Thank you!

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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.