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July 9th, 2018, 04:53 AM   #1
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How to solve apart problems?

A and B leave their places and start moving towards each other. If they are 50m apart after both 2 minutes and 3 minutes, how far apart are their places?

I draw the diagram of this problem:



After this. how to proceed from here?
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July 9th, 2018, 06:12 AM   #2
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I would write:

$\displaystyle d-50=2v$

$\displaystyle d+50=3v$

Can you proceed?
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July 9th, 2018, 07:26 AM   #3
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Further information is needed, else it needs to be assumed that $v$ is a constant.
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July 9th, 2018, 08:11 AM   #4
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Quote:
Originally Posted by MarkFL View Post
I would write:

$\displaystyle d-50=2v$

$\displaystyle d+50=3v$

Can you proceed?
why d - 50 = 2v ? why not d +50 = 2v?
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July 9th, 2018, 08:17 AM   #5
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After 2 minutes, the combined distance covered by the two moving objects is 50 m less than their initial distance apart (which I've labeled d).
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July 9th, 2018, 07:44 PM   #6
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Quote:
Originally Posted by MarkFL View Post
After 2 minutes, the combined distance covered by the two moving objects is 50 m less than their initial distance apart (which I've labeled d).
What combined distance covered by the two moving objects are you referring?

Are you referring to this:



combined distance = AC + DB?
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July 9th, 2018, 07:49 PM   #7
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Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.
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July 10th, 2018, 05:11 AM   #8
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Quote:
Originally Posted by MarkFL View Post
Yes, the combined distance covered by A and B after 2 minutes is the entire initial distance between them minus the gap between them.
What about 3 minutes?
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July 10th, 2018, 05:33 AM   #9
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Apart.PNG
Not the best diagram above, but you can get the idea.

AC + DB is now AB + 50 m (where AB = d).

Last edited by skipjack; July 10th, 2018 at 11:43 AM.
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July 10th, 2018, 05:51 AM   #10
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Quote:
Originally Posted by skipjack View Post
Attachment 9802
Not the best diagram above, but you can get the idea.

AC + DB is now AB + 50 m (where AB = d).
How did you draw the diagram? It was awesome.

I didn't get the idea, but I understand the diagram.

Last edited by skipjack; July 10th, 2018 at 11:47 AM.
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