A bicycle racer is going downhill at 15.0 when, to his horror, one of his 2.06 wheels comes off when he is 76.0 above the foot of the hill. We can model the wheel as a thin-walled cylinder 85.0 in diameter and neglect the small mass of the spokes. I already figured out that the Vf= 31.1 How much total kinetic energy does the wheel have when it reaches the bottom of the hill?