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## Homework Statement

what is the speed of en electro, initially at rest,if a total work of 50keV is done on it?

1eV=1.6*10

^{-19}j m

_{e}=9.11*10

^{-31}kg

## Homework Equations

relastic energy equaltion.

## The Attempt at a Solution

i converted the total work to total energy

E

_{total}=8*10

^{-15}

then i set E

_{total}=(mc

^{2})/(1-(v/c)

^{2})

^{1/2}

when i try solving it i keep getting sqrt of a negative #

could someone tell me where I am going wrong