Cant understand this line in the book(semiconductor nightmare 4)

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in the marked red line
how they comeup with the fact the the velocity increases by this amount
?
i didnt see this expression before in this book
 
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nhrock3 said:
how they comeup with the fact the the velocity increases by this amount

Hi nhrock3! :smile:

F = ma = m(dv/dt) …

In this case, F = qE = -eE, so m(dv/dt) = qE, so ∆v = -eEt/m. :wink: