Posted by **ali** on Friday, April 20, 2012 at 7:55am.

A 40N force applied at an angle of 37 degrees above the horizontal pulls a 5kg box on a horizontal floor. the acceleration of the box is 3meter per second square. how large a frictional force must be retarding the motion of the box.

a.50N b.13N c.17N d.25N

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