Answer to Question #261365 in Classical Mechanics for lovehug

Question #261365

a student hold her psychology textbook, which has a mask of 1.5kg out of a second-story dormitory until her arm is tired. how much work is done to a book by the student kin simply holding it out of the window?

Expert's answer

"E=mgh=1.5\\cdot 10\\cdot 6=90~\\text J."

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