1. The problem statement, all variables and given/known data The string in a yo-yo is wound around an axle of radius 0.512 cm. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.206 kg and outer radius 1.88 cm. Starting from rest, it rotates and falls a distance of 1.20 m (the length of the string). Assume for simplicity that the yo-yo is a uniform circular disk and that the string is thin compared to the radius of the axle. What is the speed of the yo-yo when it reaches the distance of 1.20 m? How long does it take to fall? 2. Relevant equations mgh=1/2mv^2+1/2Iw^2 I=1/2mr^2 w=v/r 3. The attempt at a solution r1=.512 r2=1.88 mgh=1/2mv^2+1/2(1/2mr2^2)(v/r2)^2 The answer is obviously incorrect. What exactly am I doing wrong? Thanks!