Question

A man pushes a packing case of total mass 40kg across a floor at a constant speed of 0.5m/s by exerting a horizontal force of 100N
what is the resultant force on the case
how big was the force of friction acting on the case
how much work was done in 3s
what is the Ek
into what forms of enrgy is the work done converted
what effective power does the man produce

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