The atomic mass of sodium (Na) is 22.98977
        
             
        
        
        
Julius Robert Mayer discovered the Law of Conservation of Energy.
 
        
                    
             
        
        
        
Answer
The force on the left across the lab table.
Explanation
The Newton's third law of motion states that; <em>action and reaction are equal but a ct in opposite direction. </em>
When the block of is pulled on the right with a force of X Newtons then there is a force -X Newtons applying and equal force on the left. For every action there must be a reaction with is equal and applying in the opposite direction. 
So, if the block is pulled on the right by a force of 8 N there is another equal force applying on the left. 
 
        
                    
             
        
        
        
The answer is C, a peer group.
        
                    
             
        
        
        
Answer:
In Newtonian mechanics, the gravitational energy possessed by a mass, because of the gravitational field produced by a second mass.
Explanation: