9. Which of the following BEST describes momentum? A. Inertia in motion. B. The product of mass and velocity. C. A vector that is directly related to mass and velocity D. All of the above. E. None of the above. 10. If a car is going 10 m/s and has a mass of 2500 kg what is the car's momentum? A. 25,000 kg-m/s momentum = m. velocity B. 250 kg.m/s C. 0.004 kg.m/s D. 2,510 kg.m/s 11. If a cat has a momentum of 20,000 kg.m/s and is running at 5 m/s what is the cats mass? A. 100,000 kg Mass = B. 4,000 kg C. 19,995 kg D. 20,000 kg 12. There is a 100,000 kg train moving down the track with a momentum of 50,000 kg.m/s, what is the train velocity? A. 20,000 m/s2 B. 150,000 m/s C. 2 m/s D. 0.5 m/s 13. What happens to momentum if velocity doubles? A. momentum doubles B. momentum is halved C. momentum is squared D. momentum is quadrupled