- #1
Jamesgortrig
- 6
- 0
Homework Statement
A student pushes a 0.65kg box Ali g a desk. When he stops pushing the book, it moves 85cm before stoping (slowing down in this period). Coefficient of friction between book and Table is 0.27.Calculate the work done on the book by the friction. Should it be positive or negative?
Homework Equations
Doesn't matter. Just need theory explanation.
The Attempt at a Solution
I'm struggling on the last part. I calculated work to be 1.46J, but I don't know if it's positive or negative. I say it's. Negative, because the force of friction is opposite to the displacement, but the answer says positive?