I was given the answer to this question by my instructor during class, but I still did not understand her explanation. Thank you.

1 least KE high PE AK + AU = 0 IAK = - AU= -(- mgh) AK- mgh 02 there is no loss in energy - here. The vertical height is O greeds I maximum from position land 3 KEE O , so thegrated charge in least 4 kinetic enrgy is from 18 2. PE 2. A ball is suspended by a lightweight string, as shown in the figure above. The ball is displaced to position 1 and released. The four labeled positions are evenly spaced along the arc of the ball's motion. Between which adjacent pairs of positions is the change in kinetic energy of the ball greatest? (A 1 and 2 (B) 2 and 3 (C) 3 and 4 (D) The change is the same for all adjacent pairs