<span>experimental? I hope that helps :)</span>
        
                    
             
        
        
        
Answer:

Explanation:
Given


Required
Determine the speed of B w.r.t A
The question implies that, we determine the relative velocity of B w.r.t A
Because both trains are moving towards one another, the required velocity is a  both trains:
 both trains:
This is shown below:



 
        
             
        
        
        
In the middle the nucleus is thr brain of it and the electrons spin around the whole atom
        
             
        
        
        
Two light waves will interfere constructively if the path-length difference between them is a whole number.
<h3>
SUPERPOSITION</h3>
The principle of superposition state that, when two or more waves meet at a point, the resultant displacement at that point is equal to the sum of the displacements of the individual waves at that point.
Interference of waves can either be constructive, or destructive.
The two light waves, initially emitted in phase, will interfere constructively with maximum amplitude if the path-length difference between them is a whole number of wavelenght 1λ, 2λ, 3λ, 4λ etc
The equivalent phase differences between the waves will be 2 or 360 degrees, 4
 or 360 degrees, 4 or 720 degrees, 6
 or 720 degrees, 6 1080 degrees etc
 1080 degrees etc 
Therefore, the two light waves, initially emitted in phase, will interfere constructively with maximum amplitude if the path-length difference between them is a whole number.
Learn more about Interference here: brainly.com/question/25310724
 
        
             
        
        
        
<span>Soil conservation involves protecting soil quality and preventing erosion.
Answer: A</span>