In Figure a, an electron is shot directly away from a uniformly charged plastic sheet, at speed vs = 2.0 x 105 m/s. The sheet is non-conducting, flat, and very large. Figure b, gives the electron's vertical velocity component y versus time t until the return to the launch point. What is the sheet's surface chargedensity?

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.6. 12 (ps) (6) (a) (8/w ,01) 4