Answer:
6.67 m/s
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1500
Step-by-step explanation:
We have 15 rows of 25, so 15 x 25 is 375, and we multiply that by 4 since its stacked 4 high. We get 1500.
 
        
                    
             
        
        
        
Answer:
B. 0.025
Step-by-step explanation:
 
        
             
        
        
        
Answer:
5
Step-by-step explanation:
You first start by finding the acceleration of the problem. 
a=f/m 
Which this case is 45.
The question is asking " How many times greater must it be than A?"
You then divide 
45/9
Your final answer is 5.