Final answer:
The speeds of disks A and B after colliding on a horizontal plane are determined by the mass of the disks and the coefficient of restitution. The influence of the plane's velocity and friction is negligible if the surface is frictionless and the plane is stationary.
Step-by-step explanation:
When disks A and B collide on a smooth horizontal plane, the speeds just after impact are determined mostly by the mass of the disks and the coefficient of restitution. The coefficient of restitution, which measures the elasticity of the collision, is defined as the ratio of the relative speed after the collision to the relative speed before the collision. It can vary from 0 (perfectly inelastic collision, where the objects stick together) to 1 (perfectly elastic collision, where no kinetic energy is lost). The mass of the disks also plays a critical role as, according to the conservation of momentum, the distribution of speed after the collision is dependent on the masses of the colliding objects. Other factors, like the velocity of the plane or friction coefficient, are not directly involved if the plane is assumed to be frictionless and stationary.