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Near the surface of the Earth there is an electric field of about 150 V/m which...

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 = 0.510 kg are dropped from a height of 2.00 m, but one of the balls is positively charged with q1 = 630 µC, and the second is negatively charged with q2 = -630 µC. Use conservation of energy to determine the difference in the speed of the two balls when they hit the ground. (Neglect air resistance.)

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