Final answer:
During a pole-vault jump, there are energy transformations from potential energy to kinetic energy and back.
Step-by-step explanation:
During a pole-vault jump, there are several energy transformations that occur. Initially, the vaulter has potential energy stored in their body and the elastic potential energy in the pole. As the vaulter runs and plants the pole, the potential energy is converted into kinetic energy. Then, as the vaulter jumps off the ground, the kinetic energy is transformed into gravitational potential energy as they move higher. Finally, when the vaulter reaches their highest point, the gravitational potential energy is converted back into kinetic energy as they descend.