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A student of Physics applies a constant force of 25Newtons while lifting a heavy Physics book up into the air a distance of 2.0meters. How much Work does the student do on the book?
1) 0joules, because gravity pulled down on the book
2) 5.0joules
3) 50 joules
4) The answer cannot be found without knowing the mass of the book.
5) The answer cannot be found without knowing the net Force on the book.

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MissPhiladelphia
I believe the correct answer from the choices listed above is option 3. The work done by the student to the book would be 50 J. The work done by gravity is simply the force of gravity times the displacement. That is 25N x 2 m and is equal to 50 J. Hope this answers the question.

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