Remember that the radius is from where the force acts to the pivot point. So, the radius is 0.025 m. Friction can effect a ball in two ways. Friction can cause rolling. It is the force which causes the torque of rolling.
Friction can also create heat.
The kinetic energy of an object is the sum of its entire motion. So, technically, the kinetic energy is the sum of the linear kinetic energy and the rotational kinetic energy. Computing the linear kinetic energy is relatively easy. The rotational kinetic energy is a bit more complicated. Then compute the moment of inertia.