Calculate the percentage loss of energy and velocity, Mechanical Engineering

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1. The three freight cars are rolling along the horizontal track with the velocities shown in the Figure. After the impacts occur the three cars become coupled together and move with a common velocity  v. The loaded cars A, B and C have masses of 60kg, 50kg, and 75kg, respectively. 

a. Determine the velocity v ,

b.   Calculate the percentage loss of energy of the system due to coupling. 

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     A                                  B                                     C


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