The mass of a helium atom is 4.0026amu, and its average velocity at 25°C is say, using your GU-ID (Example G000abcde, yours for this problem is GU-ID G00071922, a.bcX 10^3m/s. (for your GU-ID G000abcde, use the first three non zero digits) What is uncertainly in meters in the position of a helium atom if the uncertainty in its velocity is 1%?