(Answered) Questionan electron in an oscilloscope tub is traveling

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An electron in an oscilloscope tub is traveling horizontally with a speed of 3.9 x 10⁶ m/s. It passes through a 2.0 c=m long region with an electric field pointing upward with a magnitude of 1500 N/C. What is the electron's velocity when it emerges from the electric field region?

The answer is 4.13 x 10⁶, 91 degrees below the horizontal.

I just don't know how to solve it

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