Afootball player with a mass of 85 kg wears a uniform and helmet that have a mass of 4.5 kg. the football player moves at 2.1 m/s. what is the total momentum of the football player and uniform?

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?