question: your propessor enters a dogsled race during the winter break to get started she pulls the sled (total mass 80kg) with a force of 180N at 20degrees the sled moves 5m along horizontal.
find the work she does
find the final speed of the sled after it moves change in x=5m, assuming that it starts from rest and there is no friction
Work = Fx*d = 180*cos20 * 5 = 845.7 J.
I don't understand what you are saying in the last paragraph.