The type of energy transformation that has taken place is the conversion of potential energy to kinetic energy.
At the top of the hill, the skier has gravitational potential energy due to her height above the ground. As she descends the hill, this potential energy is converted into kinetic energy, which is the energy of motion. When she reaches the bottom of the hill and has a speed of 25 m/s, most of her initial potential energy has been transformed into kinetic energy.
In summary:
- At the top: High potential energy, low kinetic energy (at rest).
- At the bottom: Low potential energy, high kinetic energy (moving at 25 m/s).