10 kg cart is traveling at a velocity of 4 m/s in the rightward direction. It strikes a 7 kg cart also traveling at 6 m/s also in the rightward direction. The carts stick together after impact. What is the final velocity of the two-cart system?

A 68.5-kg person throws a 0.0490-kg snowball forward with a ground speed of 34.5 m/s. A second person, with a mass of 57.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.65 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice. (Take the direction the snowball is thrown to be the positive direction. Indicate the direction with the sign of your answer.) thrower = ? / m/s (Give your answer to at least three decimal places.) catcher = ? / m/s

A 65.5-kg person throws a 0.0420-kg snowball forward with a ground speed of 31.5 m/s. A second person, with a mass of 55.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.15 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice. (Take the direction the snowball is thrown to be the positive direction. Indicate the direction with the sign of your answer.)

A 1080 kg sports car is moving westbound at 15.0 m/s on a level road when it collides with a 6620 kg truck driving east on the same road at 12.0 m/s. The two vehicles remain locked together (mutual motion) after the collision. What is the velocity of the two vehicles just after the collision?