Problem 2 A 1000 kg car has four 10 kg wheels. When the car is moving, what fraction of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size.he platform has a mass of 150 kg, a radius of 2.0 m, and a rotational inertia of 3.00 kg · m 2 about the axis of rotation. A 60 kg student walks slowly from the rim of the platform toward the center.