Asked by Benjamin
                Big Bertha carries a 150 N suitcase up four flights of stairs a total height of 12 m and then pushes it with a  horizontal force of 60 N at a constant speed of 0.25 m/s for a horizontal distance of 50 m on a frictionless surface. How much work does Big Bertha do on the suitcase during this entire trip?
            
            
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