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An electron moving along the x axis has a position given by x = 14te^-5t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?

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    If the electron stops, it means that the velocity has gone to zero.

    x = 14te^-5t
    dx/dt = 14e^-5t (1 - 5t)
    that is zero when t = 1/5

    x(.2) = 1.03

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