An electron travelling with a speed of 5...

An electron travelling with a speed of `5x 10^3` m/s passes through an electric field with an acceleration of `10^12 m/s^2`. How long will it take for electron to double its speed?

`0.5 xx 10^-9 s`

`0.5 xx 10^-10 s`

`5 xx 10^-9 s`

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