Intro to Conservation of Energy Video Lessons

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Problem: A proton has an initial speed of 3.9 x 105 m/s.What potential difference is required to reduce the initial kinetic energy of the proton by a factor of 3?

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Law of conservation of energy:

Ki+Ui=Kf+Uf12mvi2+qVi=12mvf2+qVf

Final kinetic energy, Kf = Ki/3

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Problem Details

A proton has an initial speed of 3.9 x 105 m/s.

What potential difference is required to reduce the initial kinetic energy of the proton by a factor of 3?

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