1. The problem statement, all variables and given/known data A 1.8kg block is moved at constant speed over a surface for which uk = 0.25. The displacement is 2 m. It is pushed with a force at 45 degrees below the horizontal. Find the work done by: (a) the force F; (b) friction; (c) gravity 2. Relevant equations W=Fs cos (theta) s=displacement 3. The attempt at a solution First I found the force F to be 6.24 N. Then using W=Fs cos (theta) I put in: W=6.24 N * 2 m * cos 135 W= -8.82 The answer in the back of the book says 11.8, I'm wondering where I'm making my mistake.