1. The problem statement, all variables and given/known data http://imgur.com/jcZRQdu [Broken] 2. Relevant equations 3. The attempt at a solution So I know how to solve this with conservation of energy, but I can't seem to get the correct answer using kinematic equations. τnet = Iα = (MR2*(a/R)) -Tension = MRa Fnet = ma w-Tension = ma -Tension = ma - mg Plugging this into the first equation: ma-mg = MRa a-g = Ra a = g/(1-R) a = 9.8/(1-0.0800) = 10.65 m/s2 vinitial = 0 a = 10.65 m/s2 Δy = 0.45 m vfinal = ? vfinal2 = vinitial2 + 2aΔy vfinal = sqrt(2aΔy) vfinal = 3.096 m/s v = rω ω = v/r = 3.096/0.0800 = 38.7 rad/s Correct answer: 26.3 rad/s Again, I know this can be solved with conservation of energy, but I'm trying to figure it out with kinematic equations.