Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both. If you're not changing your speed and you're not changing your direction, then you simply cannot be accelerating—no matter how fast you're going.
        
             
        
        
        
A.) is chemical, B.) is physical, C.) is physical, D.) is chemical, E.) is physical, F.) is physical, G.) is physical, and H.) is chemical.
 
        
                    
             
        
        
        
Answer:
scratching a surface to make it rougher 
increasing the size of a flying object 
adding extra weight to an object 
Explanation:
 
        
                    
             
        
        
        
C.
remember
reactants ----> products