Final answer:
The skateboarder has the highest kinetic energy at the bottom of the ramp.
Step-by-step explanation:
The skateboarder has the highest kinetic energy at the bottom of the ramp.
At the bottom of the ramp, potential energy is at its minimum while the skateboarder's kinetic energy is at its maximum.
As the skateboarder goes down the ramp, potential energy is gradually converted into kinetic energy, reaching its maximum value at the bottom of the ramp.