Consider a charge Q1 = +2.0 μC fixed at a site with another charge Q2 (charge +9.0 μC, mass 7.0 μg) moving in the neighboring space. a) Calculate the potential energy of Q2 when it is 1.0 cm from Q1 U = J b) If Q2 starts from rest from a point 1.0 cm from Q1, what will its speed be when it is 2.0 cm from Q1? (Note: Q1 is held fixed in its place) v = ms