I'm somewhat clueless on how to solve the following problem, since a solid disk is rolling up a hill rather than downhill.

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.

I used KEi + PEi = KEr + KEt + PEf, which I used 135 + 0 = 45 + (0.5)(5)(v^2) + (5)(9.8)(2), and solved from there. Am I using these values incorrectly?

You have the wrong final rotational kinetic energy. The disk is still rolling when it's at the top of the hill but the angular velocity is not the same as it was before. (If the translational speed is now v, what's the angular speed?)

You would write your final translational kinetic energy in the same manner you wrote your final translational kinetic energy.

If the object has a translational speed of v then what is it's rotational kinetic energy? You already said that the translational kinetic energy would be [itex]\frac{1}{2}(5)(v^2)[/itex] so now write the final rotational kinetic energy in terms of v.

Do you mean I should write my final rotational kinetic energy in the same way? Sorry, I am getting lost, since your previous 2 posts seem to be about 2 different things wrong with the problem. Would you be able to clarify what you are referring to?

LOL I just figured that out...so w = 4.148, and then I plug that into v=rw to get v, which is 2.4888? Eek...these answers are wrong! Did I do something wrong?