Two parallel plates with length have been oppo- sitely charged and placed a distance d apart. There is a uniform electric field E - Ej present between the plates. A particle with charge q> 0 with mass m is fired horizontally into the space between the two plates. It starts out midway between the plates. Approximate the field as uniform between the plates -q and zero elsewhere. In reality the field will not be so simple close to the edges of the plates. +q m How fast must the charge be moving initially to ensure that it will pass through the field witho hitting the top plate?