Answer:
the rate of acceleration of the train is 4 m/s²
Explanation:
Given;
initial velocity of the train, u = 10 m/s
change in time of motion, dt = 5 s
final velocity of the train, v = 30 m/s
The rate of acceleration of the train is calculated as;

Therefore, the rate of acceleration of the train is 4 m/s²
 
        
             
        
        
        
Answer: 6.9x 107 in standard form is 69,000,000
        
                    
             
        
        
        
It is know as smoke because if you cook food smoke will go up in the air and that makes vapor and also water from the ground it suck up
        
             
        
        
        
The CORRECT answer would be false. They are different and so therefore the answer is false. 
Hope this helped ‼️