Question
Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 150,000 kg and a velocity of 0.300 m/s, and the second having a mass of 110,000 kg and a velocity of $-0.120 \textrm{ m/s}$. (The minus indicates direction of motion.) What is their final velocity?

$0.122 \textrm{ m/s}$

Solution Video