A toy dart gun generates a dart with .140kg. m/s momentum and a velocity of 4m/s. What is the mass of the dart in grams? (hint: figure kg, then convert answer to grams)

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?