Two uniform disks with the same mass are connected by a light inextensible string supported by a massless pulley on a frictionless axis. the string is attached to a point on the circumference of disk a (on the left) and is wound around disk b (on the right) so that the disk will rotate like a yo-yo when dropped.

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.