In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v = 3.00 × 10° m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus timetuntil the return to the launch point. What is the sheet's surface charge density? Assume t, = 14.0 ps.

In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed v = 3.00 × 10° m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus timetuntil the return to the launch point. What is the sheet's surface charge density? Assume t, = 14.0 ps.