1. The problem statement, all variables and given/known data A yo-yo has mass of 400 kg and radius of 1.5m. Its axle of rotation has a radius of 0.1m. Its string is attached to a crane. What is its final velocity after it is released. mass (m)=400 kg Radius (R)= 1.5 m axle of yo-yo (r)= 0.1 m height (h)=57m angular acceleration (x)= x 2. Relevant equations F=ma; I=(1/2)mr^2; a=xr a/r=x 3. The attempt at a solution F=ma ; Torque=Tr=Ix T=Ix/r Fnet,y = mg - T = ma mg - I(a/r)/r = ma mg = ma + I(a/r)/r mg/ (m + I/r^2) = a mg/(m + (1/2)mr^2/r^2 ) = a a = 6.53 m/s This doesnt seem right. Can anyone show me my error?