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Q. A proton is initially at rest at a point where the potential is 455V. Sometime later the proton is at a point where the potential is 191V. If no force but the electrostatic force acts on the proton, what is its final kinetic energy?

Q. Neptune has a mass 17.20 times larger than that of Earth and a radius 3.88 times larger. A person weighing 177 lb on Earth would weigh how much on Neptune?

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