
As we know, 

where,
- m = mass of the object = 0.15 kg
- g = acceleration due to gravity = 9.8 m/s²
- h = height attained by the object = 4 m
let's find the potential energy of that Apple :
 
        
             
        
        
        
Answer:
mitochondrion
Explanation:
 centrioles are found in animals only, and chloroplast cell wall is found in plants only.
Hope it helps. 
 
        
                    
             
        
        
        
I think they use the scientific method