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?
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