At sea level an argon atom in the air has an average

Question

At sea level, an argon atom in the air has an average kinetic energy of 5.61 x 10^-21 Joule. Its mass is 6.64 x 10^-26 kilogram. The argon atom shoots straight up without colliding with the molecules in the air. (Suppose that you can use g = 9.81 m/s²;

a) Determine how high would it rise?

b) Obtain what percentage of the Earth radius is this height?

c) Evaluate what is the argon atom initial speed?