An object is to move along an x axis from x = 0 to X1 while a conservative force, directed along the x axis, acts on the object. The figure shows three cases, each of which the force varies with x differently. The force has the same maximum magnitude F1 in all three cases. A R (a) (b) Rank the cases according to the change in the kinetic energy during the object's motion, most positive first. Ans: | Rank the cases according to the change in the potential energy during the object's motion, most positive first. Ans: -A - (c)