A particle completes half its journey with uniform velocity u. Then it

moves at first with a uniform velocity v through half the time required to

complete the remaining half of the journey and afterwards with a

uniform velocity w through the remaining half of the said time.

Determine the average velocity of the particle over the entire path.

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.