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Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same way from the same height. This time the ball fell for 0.645 s before landing.

What is the electric potential at a height of 1.00 {\rm m} above the ground on this planet, given that the electric potential at ground level is zero? (Air resistance can be ignored.)

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