Homework Help: physics

Posted by Anonymous on Sunday, September 30, 2012 at 9:18pm.

A dockworker loading crates on a ship finds that a 21-kg crate, initially at rest on a horizontal surface, requires a 70-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 51 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.
μstatic
μkinetic

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