Near the surface of the Earth there is an electric field
Chapter 17, Problem 78(choose chapter or problem)
Near the surface of the Earth there is an electric field of about 150 which points downward. Two identical balls with mass are dropped from a height of 2.00 m, but one of the balls is positively charged with and the second is negatively charged with 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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