Electric potential, potential difference, and potential energy
1. Here is a problem that I know how to solve
Through what potential difference would an electron need to be accelerated for it to achieve a speed of 2.3% of the speed of light (2.99792x10^8 m/s), starting from rest? Answer in units of V. For this problem I used: Code:
deltaK + deltaU = 0 2. Now here is a similar problem that I can't seem to solve An electron moving parallel to the x axis has an initial speed of 2x10^6 m/s at the origin. Its speed is reduced to 500000 m/s at the point p, 1cm away from the origin. The mass of the electron is 9.10939x10^31 kg and the charge of the electron is 1.60218x10^19 C. Calculate the magnitude of the potential difference between this point and the origin. Answer in units of V. I tried to use the same approach for this problem: Code:
(1/2)m2v2^2  (1/2)m1v1^2 = qdeltaV Code:
(1/2)m(v2^2  v1^2) / q = deltaV 3. Here is something else that I can't seem to solve Calculate the speed of a proton that is accelerated from rest through a potential difference of 69V. Answer in units of m/s. I attempt to use the same formula: Code:
(1/2)mv^2  0 = qdeltaV Any hint as to what concepts I'm missing here would be greatly appreciated. :) 
I figured it out.

how do u do it?

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