A box with a mass of 44.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough floor a distance of 7.10 m.   (a) What is the work done (in J) by the 150 N force?   (b) What is the coefficient of kinetic friction between the box and the floor?

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A box with a mass of 44.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough floor a distance of 7.10 m.
 
(a)
What is the work done (in J) by the 150 N force?
 
(b)
What is the coefficient of kinetic friction between the box and the floor?
 
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