1. The problem statement, all variables and given/known data 2. Relevant equations W= ∫F.dr 3. The attempt at a solution I'm fairly sure I've done the right thing, however my lecturer hasn't uploaded any solutions to any of these problems (which is ridiculous - how am I supposed to learn if I don't know when I'm right or wrong?!) So I'm putting it over to physics forums for some general opinion on my answer. The path between (1,4,2) and (0,5,1) is a simple move of (-1,-1,-1), This parameterises to a move of (-t,-t,-t) for 0<t<1 and means x= -t, y= -t, z= -t so dr = (-t,-t,-t) = (-1,-1,-1)dt and F = (x, 3xy, -(x+z)) = (-t, 3t2, 2t) Which gives ∫F.dr = (-t, 3t2, 2t )(-1,-1,-1)dt = ∫ (t -3t2 - 2t) dt = [t2/2 - t3 - t2] , 0<t<1 = -3/2 units of work So am I right? Or mostly right? Or mostly wrong? Or totally wrong? Thanks a lot!