Question

How much kinetic energy is gained by an electron that is allowed to move freely through a potential
difference of 2.5 × 10^4 V?

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U=qV
=(1.6*10^-19)(2.5*10^4)
=4*10^-15

I'm not sure what other formulas i can use, or how to relate potential energy to kinetic energy because such little information is given...

Answer 1

you have it.