<span> energy produced by flow of electric charge describes a electrical energy
because movement of electric charge do effect the work on system 
so correct option is B 
hope it helps</span>
        
                    
             
        
        
        
Compound; consists of atoms of two or more different elements bound together,can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means) has properties that are different from its component elements, and always contains the same ratio of its component atoms.Mixtures; Note that a mixture:consists of two or more different elements and/or compounds physically intermingled, can be separated into its components by physical means, and often retains many of the properties of its components.
        
             
        
        
        
C i would think
it sounds best 
        
             
        
        
        
Answer:
A
Explanation:
its oxygen I hope i am correct have a great day.
 
        
             
        
        
        
Answer:
Explanation:
Given
initially mass is stretched to 
Let k be the spring Constant of spring 
Therefore Total Mechanical Energy is 
Position at which kinetic Energy is equal to Elastic Potential Energy


it is given

thus 


