In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v, - 3.70 x 105 m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus time t until the return to the launch point. What is the sheet's surface charge density? Assume t, - 18.0 ps. ((ps) (6) 4 (a) v (10 m/s) -V₂

In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v, - 3.70 x 105 m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus time t until the return to the launch point. What is the sheet's surface charge density? Assume t, - 18.0 ps. ((ps) (6) 4 (a) v (10 m/s) -V₂