d kinetic friction between a 476 N crate and the warehouse floor are 0.615 and 0.420, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on

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The coefficients of static and kinetic friction between a 476 N crate and the warehouse floor are 0.615 and 0.420, respectively. A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push. What is the acceleration of the crate after it has begun to move? Start with a free-body diagram!

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We know that the coefficients of static and kinetic friction between the 476 N crate  and the warehouse floor are is 

μs= 0.615 and μk= 0.420 

 A worker gradually increases his horizontal push against this crate until it just begins to move and from then on maintains that same maximum push. 

free body diagram 

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