1) Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Two identical balls with mass m = 0.570 kg are dropped from a height of 2.20m , but one of the balls is positively charged with q1=750C, and the second is negatively charged with q2 = -750 C

Use conservation of energy to determine the difference in the speed of the two balls when they hit the ground. (Neglect air resistance.)