Electrons are accelerated from rest through a potential differenceof 250000 V. W

Question

Electrons are accelerated from rest through a potential differenceof 250000 V. What is the final speed predicted relativistically?

I converted  V to J then I used KE=mc2 -m0c2 I'm pretty sure this is the eq. so I think my calculation iswrong. Can someone please help What is the final speed predicted relativistically?

I converted  V to J then I used KE=mc2 -m0c2 I'm pretty sure this is the eq. so I think my calculation iswrong. Can someone please help I'm pretty sure this is the eq. so I think my calculation iswrong. Can someone please help

Explanation / Answer

   V = 250 kV    e V = mo c2 /    where = 1 /[1 - (v2/ c2)]

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