Physics

When the ball is released from rest at the top of the frictionless track, it starts with potential energy. As it moves down the track, the potential energy is converted into kinetic energy.

The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. In this case, the work done by gravity is responsible for converting the ball's potential energy into kinetic energy.

Initial Energy:

The ball starts from rest, so its initial kinetic energy is zero. It has only potential energy due to its height on the track.