Constants ${?}_{(})$

Part A

A uniform electric field exists in the resion between two oppositely charged plane parallel plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, $3\mathrm{.}90cm$ distant from the first, in a time interval of $2\mathrm{.}30{10}^{-8}s.$

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Find the magnitude of this electric field.

Express your answer in newtons per coulomb.

Part B

Find the speed of the electron when it strikes the second plate.

Express your answer in meters per second.