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Q. A spring has a spring constant, k, of 435 N/m. How much must this spring be stretched to store 23 J of potential energy?

Q. A proton is initially at rest at a point where the potential is 472 V. Some time later the proton is at a point where the potential is 190 V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.

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