What happens to the sum of the balls kinetic energy and potential energy as the ball rolls from point to point assume theres no friction between the ball and the ground
The sum decreases
The singeses
The sumres the same
The sum always equals zero

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.