5. In the game of shuffleboard, you push plastic disks forward and then release them so that they slide across a level playing surface. Once you release a disk, you are no longer pushing and it gradually skids to a stop. Its final position determines your score. As each disk skids to a stop, what becomes of the kinetic energy it had when you released it? That energy is

• now elastic potential energy in the disk.
• still present in the disk, as it must be because kinetic energy is conserved and can’t be created or destroyed.
• now thermal energy in the disk and playing surface.
• now gravitational potential energy in the disk.