Freight car A has a mass of 1000kg and is traveling at 4 m/s. It collides with freight car B. Freight car B has a mass of 3000kg and is stationary. What will be their resultant velocity.

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?