A law is partial of a theory, basically only a section of it. A theory is in a way a whole unit and understanding of the subject
I hope this helps ^^
Good luck
Answer:

Explanation:
Given:
Represent
- Susan's velocity with 
- Michael's velocity with 
eastwards
westwards
Required
Determine how fast is
relative to 
From the question, one train moves eastwards while the other moves westwards.
This means that travel in opposite travel and the relative speed (V) is calculated as:

Substitute values for
and 


<em>Hence, the Susan's train is moving 2m/s in relative to Michael's train</em>
the answer is a i hope its corrcet your welcome daw