- #1
Rick16
- 60
- 18
- TL;DR Summary
- getting the sign right with the work-energy theorem
This is problem 3 in section 2.3.4 from Conquering the Physics GRE by Kahn and Anderson:
And here is the solution from the book:
The point of confusion for me is that they use the work-energy theorem in the form W = Tinitial - Tfinal, instead of the other way around. If I were to do this problem, I would write W = Tfinal - Tinitial, but then I end up with a negative time, which does not make sense. What am I missing?
And here is the solution from the book:
The point of confusion for me is that they use the work-energy theorem in the form W = Tinitial - Tfinal, instead of the other way around. If I were to do this problem, I would write W = Tfinal - Tinitial, but then I end up with a negative time, which does not make sense. What am I missing?