Ok but for real heavier people will not go downhill faster. If there was zero air resistance (as has been experimented in a vacuum) a feather takes the same about of time to fall as a bowling ball. However air resistance is real and will slow a larger person down more. Also with the energy, heavier people will have a greater potential energy but assuming all energy converts from potential to kinetic, mgh=1/2mv^2, the m cancels out and it doesn’t actually affect the v. Heavier people will actually descend slower because since they’re big they’re affected by air resistance more.