A delivery person, after unloading a 52-kg crate full of equipment, starts pulling the crate horizontally along the driveway. He found out that he had to pull the crate with a force of 230 N to get it started moving, but once it did start moving only 200 N was enough to maintain a uniform motion. What are the coefficients of static and kinetic frictions between the crate and driveway surfaces? How much work was done by the person if the driveway is 20 m long? (Take g = 10 m/s2).

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