Answer:
always same 
Explanation:
velocity and speed are same upto some extend but velocity is vector while speed is scalar quantity
 
        
             
        
        
        
Answer:
d. the force is reduced by one quarter to 3.6 n
Explanation:
 
        
             
        
        
        
Answer:
It helps the answer look clean. It also makes the work easier to work with. 
Explanation:
Instead of writing a lot of zeros, all you have to do is add exponents to the number to show how much the decimal moved.
 
        
             
        
        
        
Okay, 90% of this is nonsense besides the numbers maybe.
        
             
        
        
        
If I remember correctly, it is the 3rd answer choice.