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January 7th, 2014, 03:05 AM  #1 
Senior Member Joined: Jan 2013 From: Italy Posts: 154 Thanks: 7  Trivial problem to obtain Distance from Velocity.
Hi, i don't know if this is the right place to post this but, I want to know if i'm done right about this very trivial physic problem. Can you help me please? I wasn't so good about physics in high school, so now i'm trying to do physics in a rational way because I want to comprehend every passage that brings to obtain a particular formula. I have this basic problem: A train travels away at a velocity mph (miles per hour). At it is distance from us. Write the equation for the distance the train is from us in terms of time . So: reading this problem I can understand that we know the velocity, and that is . By definition, the velocity is the distance traveled divided by the time. So in a plot with space in function of time, this velocity, is the slope of the line in that one. Reading the problem, I don't know anything about the distance formula, so I want to obtain that from the velocity, that I call , and, by definition, it is the ratio of to : we know that so: from this last equation I can obtain the distance: this last equation I obtained is the equation of the distance. I think that this is the right way to follow to obtain it. is it right? many thanks for your patience! 
January 7th, 2014, 11:58 AM  #2 
Global Moderator Joined: May 2007 Posts: 6,805 Thanks: 716  Re: Trivial problem to obtain Distance from Velocity.
It will be a lot quicker and clearer if you multiply through by t right after the second line to get: vt = S  So. Therefore S = So + vt. 

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