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electron is projected to a fixed proton

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An electron is projected with an initial speed of 4.8 *10^5 m/s directly toward a proton that is fixed in place. If the electron is initially a great distance from the proton, at what distance from the proton is the speed of the electron instantaneously equal to twice the initial value?

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The solution explains the motion of the electron, which is projected to a proton at a fixed place.

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The electron is released from a ...

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