Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

TwistyPuzzles.com Forum

It is currently Tue Jul 22, 2014 7:03 pm

All times are UTC - 5 hours



Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Kinematics: 1D
PostPosted: Sun Sep 22, 2013 6:57 pm 
Offline
User avatar

Joined: Fri Feb 20, 2009 6:38 pm
Silly, cocky me. I thought I had my 1D kinematics down from Grade 10. Come U1 Physics (remarkably boring, because I was a master at projectile motion), I decide to brush up. But apparently, I've forgotten a key point and I would like to check it out.

The situation is as follows:

Person 1 travels at 11.5 m/s and is 11.8 meters ahead of person 2. Person 2 travels at 9.7 m/s and accelerates at 1.2 m/s. I'm attempting to find the amount of time it takes for the second person to catch up

By my reasoning, the second person travels the same distance as the first person plus that 11.8m, giving d1=d and d2=d+11.8. They both take the same amount of time to cover their respective distances.

Is my reasoning correct? My solution depends on it...

_________________
Puzzle Photography Group
Facebook

doctor who wrote:
I don't think I can make her pose without heavy sedation. The rendering doesn't have to be perfect, it just can't look like Oskar in drag.


Top
 Profile  
 
 Post subject: Re: Kinematics: 1D
PostPosted: Sun Sep 22, 2013 8:40 pm 
Offline

Joined: Thu Oct 04, 2012 8:49 pm
I believe it goes as such:
Person 1; x = v0 t + x0
Person 2; x = a t^2 + v0 t + x0
Set them equal to each other and solve for t.
x0 is initial position
v0 is initial velocity


Top
 Profile  
 
 Post subject: Re: Kinematics: 1D
PostPosted: Mon Sep 23, 2013 12:52 pm 
Offline
User avatar

Joined: Sat Mar 26, 2011 9:56 am
quicksolver wrote:
By my reasoning, the second person travels the same distance as the first person plus that 11.8m, giving d1=d and d2=d+11.8. They both take the same amount of time to cover their respective distances.

Is my reasoning correct? My solution depends on it...

Your reasoning sounds correct to me.

_________________
"A man who never made a mistake...never made anything."


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Forum powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group