A proton enters a region of uniform electric field of magnitude $79\mathrm{.}5$ N$/$C with an initial velocity of $20\mathrm{.}9$ km$/$s directed perpendicularly to the electric field. What is the speed of the proton $1\mathrm{.}96$ s after entering this region?  

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To solve this problem we can use the equation of motion for a charged particle in an electric field ... View the full answer