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Q. On planet Tehar, the free-fall acceleration is the identical as that on Earth, but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.03kg ball having a charge of 5.01 µC is thrown upward at the speed of 20.1 m/s. It hits the ground after an interval of 4.1s. What is the potential difference between starting point and the top point of the trajectory?

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