Answer:
Without this slack, a locomotive might simply sit still and spin its wheels. The loose coupling enables a longer time for the entire train to gain momentum, requiring less force of the locomotive wheels against the track. In this way, the overall required impulse is broken into a series of smaller impulses. (This loose coupling can be very important for braking as well).
Explanation:
 
        
             
        
        
        
Answer:
b
Explanation:
 i took the quiz i think its right
 
        
             
        
        
        
A. Acceleration. 
acceleration is m/s^2. speed is m/s
        
             
        
        
        
Answer:
Explanation:
Gravitational Potential Energy at earth surface 
Gravitational Potential Energy at height h is 
Energy required to lift the satellite 

Now Energy required to orbit around the earth 



 (given)
  (given)




(b)For greater height  is greater than
  is greater than 
thus energy to lift the satellite is more than orbiting around earth