# Homework question needed because physics teacher doesnt want to help me

1. Sep 3, 2012

### ArcherofScience

1. The problem statement, all variables and given/known data
An electron travels 1.68 m in 6.74 × 10−8 s.
How fast is it traveling?

2. Relevant equations

3. The attempt at a solution

(1.68)/ (6.74 x 10 ^ -8) = 24925816.02

i asked the teacher on this education facebook thingy for our school called edmodo if i was getting it right, teacher said he didn't understand what i meant by that . He didn't answer my second question, I'm now confused.

2. Sep 3, 2012

### micromass

Staff Emeritus
Seems correct!!

However, don't forget your units. This is very important as it will prevent you from making mistakes.

What you should write is:

$$\frac{1.68 m}{6.74\cdot 10 ^{ -8} s} = 24925816.02 \frac{m}{s}$$

Last edited: Sep 3, 2012
3. Sep 3, 2012

### ArcherofScience

so it is correct and my calculator isn't crazy? thankyou micro so much :D !! yes i won't forget my units! :)