A 5000-kg freight car crashes into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg freight car?
A) 4 m/s
B) 5 m/s
C) 6 m/s
D) 8 m/s
E) none of the above
Answer: C
Physics & Space Science
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