from a homework

Degree Level: Pre-College

 

Question:

Two railroad cars (2 X 10^4 kg each) are traveling in the same direction along a railroad track. Car A is traveling at 14 m/s, and Car B is traveling at 10 m/s. When Car A catches up with Car B, the two cars link together. What is the velocity of the combined cars after the collision?

Answer:

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