You should make a density trap, you get different liquids with different density's ( corn starch , water , alcohol , syrup) and pour them into a big vase and the different density's will sit on top of each other . the best thing to do is to use food coloring so that  each level is a different color.
        
                    
             
        
        
        
Answer:
I think that it might be 2.7
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Answer: avogadros number/constant
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It's (d) VELOCITY 
If statement were just 60mph it would've been SPEED