1. The problem statement, all variables and given/known data The three balls in the figure which have equal masses, are fired with equal speeds at the angles shown. Rank in order, from largest to smallest, their speeds as they cross the dashed horizontal line. (All three are fired with sufficient speed to reach the line.) 2. Relevant equations Ep = mgh K = 0.5mv2 3. The attempt at a solution Since the vo is equal for each ball, we can conclude that vocy > voby > voay. Since the force of gravity has the same effect on each ball, we can conclude that at the line vc > vb > va However, I am getting the problem wrong on MasteringPhysics. I know this is an energy problem, but I can't get past how simple the problem is in my head.