Answer:
Then final velocity of the coupled system of cars will be 0.58 m/s
Explanation: Let us consider the car-1 is moving towards right (say + ve direction) and car-2 is moving towards left (say in - ve direction), accordingly velocity are considered +ve and -ve.




Applying the conservation of momentum, and let the final velocity of combined system is V m/s


26250 - 9000 = 29500
V
V =
= 0.58 m/s
Then final velocity of the coupled system of cars will be 0.58 m/s
Copper will still be a solid at room temperature
Here is the link for the info: http://education.jlab.org/itselemental/ele029.html
Answer:
the answer will be 3.763 seconds