Rank the cases according to the change in the kinetic energy during the object's motion, most positive first. Rank the cases according to the change in the potential energy during the object's motion, most positive firs 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. R (a) x1 F -F (c) (b) x