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A solid disk (mass = 5 kg, R = 0.6m) is rolling across a table with a translational speed of 6 m/s. The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational speeds now.

I tried using KEi + PEi = KEf + PEf, including both KEt and KEr in KEf, and I calculated that KEi = 135J (45J are KEr, and 90J are KEt). I'm not sure if I'm plugging in my values correctly, since I got a translational speed of 3.847, and my answer was wrong.