Starting and finishing energy of a sledge and its passengers coming down a slope starting from a rest?

When a sledge and its passengers start from rest at the top of a slope, they possess gravitational potential energy due to their height. As they descend, this potential energy converts into kinetic energy, increasing their speed. At the bottom of the slope, the total mechanical energy (neglecting friction and air resistance) remains constant, with potential energy being at its lowest and kinetic energy at its highest. Thus, the starting energy is all potential, while the finishing energy is primarily kinetic.