(21-59) At what angle will the electrons in Example 21-16 leave the uniform electric field at the en

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(21-59) At what angle will the electrons in Example 21-16 leave the uniform electric field at the end of the parallel plates (point P in Fig. 21-41)? Assume the plates are 4.9 cm long and E = 5.0 X 103N/C.
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What to substitute in for v(0)? Can't figure out the value.. :\

_mikal