Near the surface of the Earth, there is an electric field of about 150 V/m pointing downward. Two identical balls with a mass of 0.323 kg are dropped from a height of 1.84 m, but one of the balls is positively charged with q₁ = 417 μC, and the second is negatively charged with q₂ = -417 μC. Use conservation of energy to determine the difference in the speeds of the two balls when they hit the ground. (Neglect air resistance.)