Final answer:
A skateboarder has no kinetic energy at the top of a ramp and maximum potential energy, exemplifying conservation of energy.
Step-by-step explanation:
On a ramp, a skateboarder would have no kinetic energy at the very top of the ramp when they are momentarily motionless before descending. At this point in time, the skateboarder's potential energy would be at its maximum value, as they have the greatest height above the ground level. This scenario is a practical example of the conservation of energy in physics, where energy is transformed between kinetic and potential forms, but the total mechanical energy remains constant if no other external forces like friction are at play.