A. helium, neon and argon, because they are in the same group or column
        
             
        
        
        
3 because of the thing it’s trying to say
        
             
        
        
        
Answer:
Displacement is the shortest distance travelled by a moving body through a entire journey.
The work done by the man pushing a fixed wall with the force of 100N is zero
work = force * displacement
Explanation:
 
        
             
        
        
        
Answer:
Empirical formula is C3H3O
Molecular formula C9H9O3
Explanation: 
From the question given, we obtained the following data:
Carbon = 63.15%
Hydrogen = 5.30%
Oxygen = 31.55%
We can obtain the empirical and molecular formula by doing the following as illustrated in the attached file. Please see attachment for explanation. 
 
        
                    
             
        
        
        
They would most likely speed up.