# Homework Help: A velocity Question

1. Oct 4, 2009

### PcStudent

1. The problem statement, all variables and given/known data
A train leaves the station at the 234.5 m marker traveling at a constant velocity of 39.3 m/s.

a.) How many seconds later will the train pass the 2034.6 m marker?

b.) What is the velocity of the train in km/h?

2. The attempt at a solution

Hey Everyone. I am completely new to this site and I am not sure how everything works on here. I recently started taking high school level physics and I am completely lost. I honestly have no idea on how to even begin these problems. The teacher is way too fast for me. So I was wondering if someone could be as kind as to give me a very detailed description on how to answer this. I'm hoping that if I understand how to do the first problem I will be able to understand how to do the rest on the worksheet. Thanks in advance to all who answered.

Last edited: Oct 4, 2009
2. Oct 4, 2009

### Delphi51

Welcome to the forum, PC!
You should have a formula that applies to this situation. The train is moving at "constant velocity" (sometimes called "uniform motion") and the formula for it is d = vt where d is the distance travelled, v the speed or velocity and t time time. This problem has been made a little tricky: the distance travelled is not 234.5 m or 2034.6 m, but rather the difference between those two numbers. The velocity is given. So, you have two of the 3 letters in the d = vt formula. The idea is to replace the appropriate letters with those numbers. Look at the result and figure out what to do to get the remaining variable, t, all by itself on one side. Then you can run the numbers on the other side through your calculator to get the answer.

I'm a retired high school physics teacher with a lot more time than I had when teaching. I know it is tough to get an hour of a teacher's time. This forum is great when you have trouble with a particular question, but when you have trouble getting into physics at first, I would really recommend that you find yourself a local student a year or two older who's been through it and pay whatever you have to for several hours of tutoring. Pick someone who has very good or excellent marks.

3. Oct 4, 2009

### PcStudent

Thank you for the assistance. I actually figured out what to do before looking at your reply. I would get a tutor to help me out but sadly I already pay 800 a month for my school and can not afford a tutor. Also, my classes are only 40 min. So I think you can imagine how fast my physics teacher rushes the class.

4. Oct 4, 2009

### Delphi51

Excellent! Good start. Keep on top of that class - it is a terrific waste of time and money if you get behind and can't follow it. I'll bet you can find a free tutor or one you can barter with if you try.