Electric field affecting a charged particle question

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SUMMARY

The discussion focuses on the behavior of a charged particle, specifically a virus with a mass of 1.00 × 10-15 kg and a charge of -1.60 × 10-19 C, in an electric field of strength 2.00 × 105 N/C between oppositely charged parallel plates. The participant seeks to determine the velocity and position of the virus 75.0 ms after it acquires the charge, while also considering gravitational effects. The calculated position after 75.0 ms is 6.24 cm. The participant expresses confusion regarding the application of conservation of energy and the incorporation of time into the calculations.

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crispy_nine
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At the moment I'm trying to figure out charged particle in electric field behavior and there's a type of question that seems to be confusing me lots.
Ok, here's such a question that I'm not sure about:

A virus rests on the bottom plate of oppositely charged parallel plates in the
vacuum chamber of an electron microscope. The electric field strength between
the plates is 2.00 × 105 N/C, and the bottom plate is negative. If the virus has a
mass of 1.00 × 10–15 kg and suddenly acquires a charge of –1.60 × 10–19 C, what
are its velocity and position 75.0 ms later? Do not disregard gravity.
Answer: ( y = 6.24 cm )

I was trying to apply conservation of energy but I'm not sure how to involve the time aspect. I'd appreciate any insight. Thanks
 
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To find the time, start by finding the acceleration.
 

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