Answer:
The unit of energy is joule which depends upon the fundamental unit kg, m and sec. So, the unit of energy is a derived unit.
Explanation:
 
        
                    
             
        
        
        
<h2>
Its velocity when it crosses the finish line is 117.65 m/s</h2>
Explanation:
We have equation of motion s = ut + 0.5 at²
         Initial velocity, u = 0 m/s
         Acceleration, a = ?
         Time, t = 6.8 s    
         Displacement, s = 1/4 mi =    400 meters
      Substituting
                       s = ut + 0.5 at²
                       400 = 0 x 6.8 + 0.5 x a x 6.8²
                       a = 17.30 m/s²
Now we have equation of motion v = u + at
      Initial velocity, u = 0 m/s
      Final velocity, v = ?
      Time, t = 6.8 s
       Acceleration, a = 17.30 m/s²
      Substituting
                       v = u + at  
                       v = 0 + 17.30 x 6.8
                       v = 117.65 m/s
Its velocity when it crosses the finish line is 117.65 m/s
 
        
        
        
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