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9. What is the momentum of a cannon after firing a cannon ball that has an initial momentum of 6,000 kg'm/s to the right? A) zero B) 3,000 kg'm/s to the right C) 3,000 kg'm/s to the left D) 6,000 kg'm/s to the left Before After 2 kg m/s 6 kg m/s 10. A tennis ball approaches a racket with a momentum of 2 kgim/s and bounces back with a momentum of 6 kg m/s after the collision with the racket. What is the change in momentum of the tennis ball? (REMEMBER DIRECTION MATTERS) A) 2 kg m/s B) 4 kgim/s C) 6 kg m/s D) 8 kg.m/s 11. A stationary skateboarder I with a mass of 80 kg pushes a stationary skateboarder II with a mass of 60 kg. After the push the skateboarder II moves with a velocity of 4 m/s to the right. What is the velocity of the skateboarder I? A) 3 m/s to the left B) 5 m/s to the left C) 1 m/s to the right D) 3 m/s to the right 12. What is the force on a 4 kg object traveling at 2 m/s and speeds up to 10 m/s over a period of 0.02 seconds. A) 1600 N 600 J C) 1.6 N D) 39.2 N