Note: Explain your steps. For problems 1 to 3 show first that the force F is conservative by testing the curl of E. l. A body is displaced from E= (2m, 4m, 6m) to H; = (6m, 4m, 2m) under a constant force l5 = (2. 3, 1) N, all in cartesian coordinates. Find the work done. (Marks: 2) 2. A force F= if acts on a particle in the x-direction. Find the work done by this force in displacing the particle from x = +1: tox = +2.51. Here. It and a are positive constants. (Marks: 3) 3. A body is displaced from position vector = (2 f + 3'3?) to 13' = (42 + 65'!) under a constant force l5 = 3 x2 f + 2 y 377. Find the work. done by this force. (Marks: 3)