Physics:Force and Friction

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Question description

A dockworker loading crates on a ship finds that a 30-kg crate, initially at rest on a horizontal surface requires a 72-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 51N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor. 

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