What is the magnitude of the acceleration of an electron

[athos]

Please help on the last question. Most likely it's something simple, but I just can't see it. Thanks.
(a) What is the magnitude of the acceleration of an electron in a uniform electric field of 4.20 106 N/C?
a= 0.73x10^18 m/s2 (Correct)

(b) How long would it take for the electron, starting from rest, to attain one-tenth the speed of light?
t= 0.40x10^-10 s (Correct)

(c) How far would it travel in that time?
I applied d=at^2/2, with the above values for a and t, but it is not correct.

Thanks.

 

[Swapnil]

Maybe you are just doing the computation wrong. Everthing seems right, you should get the right answer...

 

[athos]

d=at^2/2=0.73x10^18x0.4x10^-10x0.4x10^-10/2=0.0584x10^-2= 0.000584 (m), but it comes back as incorrect. Thanks for quick reply.