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An electron is projected with an initial speed of 8.5 ✕ 105 m/s directly toward a...

An electron is projected with an initial speed of 8.5 ✕ 105 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?

______M

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