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Physics Force & Laws Of Motion Level: High School

A dockworker loading crates on a ship finds that a 20 kg crate , initially at rest on a horizontal surface , requires a 75 N horizontal force to set it in motion . However , after the crate in motion , a horizontal force of 60 N is required to keep it moving with a constant speed . Find the coefficients of static and kinetic friction between crate and floor .