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39. Which of the following is the appropriate unit for the mathematical expression?
   
A. mass x distance
-----------------------   and watt
          time
      
kg x m                            N x m
-----------   not equal to  ------------
    s                                      s
    
B. mass x distance2
-----------------------  and watt
          time
kg x m2                         N x m          kg x m x m
-----------  not equal to  ------------  =  ---------------
     s                                   s                     s3 
    
C. mass x distance2
-----------------------  and joule
          time2
kg x m2                                        kg x m x m
------------   is equal to   N x m = -----------------
     s2                                                   s2  

The Correct Answer is C.

      
D. mass x distance
-----------------------   and joule
          time3
kg x m                                            kg x m x m
------------   no equal to   N x m = -----------------
     s3                                                    s2