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## Homework Statement

In a freight yard a train is being put together from freight cars. An empty freight car, coasting at 10m/s, strikes a loaded car that is stationary, and the cars couple together. Each of the cars has a mass of 3000 kg when empty, and the loaded car contains 12,000 kg of canned soda. With what speed does the combination of the two cars start to move?

## Homework Equations

p=mv (f)(change in time)=p

## The Attempt at a Solution

calculated p for empty car p=(10)(3000) p=30,000

calculated the full momentum p=(10)(15000) p=150,000

totaled the masses to find the velocity 180,000=18,000v v=180 m/s