To solve this question, we need to understand the types of energy involved in pole vaulting and what happens to these energies during the jump. Step 1: Identify the types of energy involved in pole vaulting. - Kinetic energy: energy associated with the athlete's movement. - Gravitational potential energy: energy associated with the athlete's height relative to the ground. - Elastic potential energy: energy stored in the pole due to its deformation. Step 2: Analyze what happens during the jump. - The athlete starts the run with kinetic energy. - When planting the pole in the ground, some of this kinetic energy is converted into elastic potential energy in the pole. - The pole, as it straightens, converts the elastic potential energy back into kinetic energy, helping the athlete gain height. - As the athlete rises, some of the kinetic energy is converted into gravitational potential energy. Step 3: Consider the highest point of the athlete's trajectory. - At the highest point, the athlete loses contact with the pole, so there is no more elastic potential energy involved. - The athlete's vertical velocity is zero at the highest point, but he still has a horizontal velocity (1 cm/s), which means he still has kinetic energy. - At the highest point, the gravitational potential energy is maximum, as it is the point of the athlete's greatest height relative to the ground. Step 4: Conclude about the types of energy at the highest point. - At the highest point, the athlete has kinetic energy due to his horizontal velocity. - At the highest point, the athlete has gravitational potential energy due to his height. - There is no more elastic potential energy, as the athlete is no longer in contact with the pole. Step 5: Choose the correct alternative based on the analysis. - The correct alternative is the one that states that the athlete has only kinetic and gravitational potential energy at the highest point of his trajectory, after losing contact with the pole.