Momentum = mass • velocity 
v= 17.5/2.5
 = 7 m/s
        
                    
             
        
        
        
I believe it’s B; Theories may be proven to be true and become laws. 
A would make sense if we were talking about hypotheses however, we’re not.
        
             
        
        
        
The number converted is 
Explanation:
In order to convert from the original units to the final units, we have to keep in mind the following conversion factors:



The original unit that we have is

Therefore, it can be rewritten as:

Therefore, since the initial number was 0.779, the final value is

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