Net work by applied force and friction on 109-kg crate

[eanderson]

A 109-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 38.3 ° below the horizontal. The coefficient of kinetic friction is 0.260. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?

 

[eanderson]

Fk = ukN...

 

[learningphysics]

Suppose the box travels a distance d horizontally... then what is the work done by the force P ?