At what temperature would the average speed of helium atoms equal? (a) The escape speed from Earth,

Question:

At what temperature would the average speed of helium atoms equal?
(a) The escape speed from Earth, 1.12 X 104 m/s and
(b) The escape speed from the Moon, 2.37 X 103 m/s? (See Chapter 13 for a discussion of escape speed, and note that the mass of a helium atom is 6.64 X 10-27 kg.)