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Having some difficulty with this question... is there any proportionality law between potential difference and velocity?

An electric charge accelerated from rest through a potential difference of 250 V reaches a speed of 9.4 x 10^6 m/s. What speed will this same charge reach if it is accelerated by a potential difference of 125 V?

So I started with conservation of energy. Ek = Ep.

(.5)mv^2 = Ue = qV

But how can I complete this without knowing its mass or quantity of charge?

Thanks in advance!

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# Homework Help: Connection between potential difference and velocity?

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