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## Homework Statement

An electron with a speed of 5.57 × 108 cm/s in the positive direction of an x axis enters an electric field of magnitude 2.72 × 103 N/C, traveling along a field line in the direction that retards its motion. (a) How far will the electron travel in the field before stopping momentarily, and (b) how much time will have elapsed?

## Homework Equations

KE= .5mv^2

F=EQ

E=kq/r^2

W=FD

## The Attempt at a Solution

For part A I got it correct which is 0.0325m.

I solved it by first calculating KE of the particle: .5 (9.11 E-31)(5.57 E 6) [converted velocity into m/s instead of cm/s]

KE= 1.413 E -17 J

Then I calculated F, F= (1.6 E-19)(2.72 E3) F=4.352 E-16

With those two values I plugged them into W=FD and got 0.0325m

Now to find the time I used all necessary information and applied t=d/v

t=0.0325m/5.57 E 6 t=5.83 E -9 s

On the homework I entered it both in scientific notation and by the complete decimal but it keeps marking it wrong. I've gone through it several times to make sure I did not do any calculations incorrectly but I cant seem to find any.

I would really appreciate it if someone could please review my work and see if it is correct. Thanks