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3. [-/2.85 Points] DETAILS OSCOLPHYS2016ACC 8.3.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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 180,000 kg and a velocity of 0.300 m/s, and the second having a mass of 95,000 kg and a velocity of -0.120 m/s. (The minus indicates direction of motion.) What is their final velocity (in m/s)? (Enter a number.) m/s