Answer:
PE = 58.8,J
Explanation:
The potential energy at the top of ramp1 can be found by the application of the formula PE = mgh
Where PE =potential energy 
m = mass of block = 2kg
g = acceleration due to gravity = 9.80m/s²
h = height of the top of the ramp from its bottom where the block is initially positioned = 3m
PE = 2×9.8×3 = 58.8J 
 
        
             
        
        
        
ur answer is A or also known as 
When you push a child on a swing, you are doing work on the child because  you are pushing against the force of gravity
hope this helps :)
 
        
                    
             
        
        
        
“a point representing the mean position of the matter in a body or system.”
        
             
        
        
        
Opposite force in the opposite.
        
             
        
        
        
Answer: A. by analyzing and making inferences about them
Explanation: