A 5000-kg freight car runs 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 car?

Name: A 5000-kg freight car runs 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 car?
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Question

Quizplus · Accepted Answer

Using the conservation of momentum: (5000 kg * v) + (10000 kg * 0 m/s) = (5000 kg + 10000 kg) * 2 m/s. Solving for v gives v = 6 m/s.

A 5000-Kg Freight Car Runs into a 10,000-Kg Freight Car