1. The problem statement, all variables and given/known data A 11.0 kg crate is pulled up a rough incline with an initial speed of 1.3 m/s. The pulling force is 121.0 N parallel to the incline, which makes an angle of 12.6◦ with the horizontal. The coefficient of kinetic friction is 0.31 and the crate is pulled a distance of 8.0 m. The acceleration of gravity is 9.81 m/s^2 . 2. Relevant equations a) Find the work done by Earth’s gravity on the crate. Answer in units of J. 3. The attempt at a solution Fnormal=m*g*costheta Fnormal=105.3111778N Fnormal* coefficient of friction=Ffriction Ffriction=32.64646511N Fapplied-Ffriction=Fnet Fnet=88.35353489N Work=N*m Work=706.8282791N*m -(Work*sin12.6)=W done by gravity Work done by gravity is 154.1898119N*m I think I did it right, but the computer marked me wrong. Can anyone explained this?