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IMPULSE-MOMENTUM PROBLEMS: 1. A 1.2 kg ball is coming straight at an 80 kg soccer player at 15 m/s who kicks it in the exact opposite direction at 24 m/s with an average force of 1400 N. How long are his foot and the ball in contact? 2. A 1600 kg car moving eastward with a velocity of 12 m/s collides with a utility pole and is brought to rest in 0.40 s. Find the force exerted on the car during the collision. 3. How much force is required to stop a 80 kg a man traveling at 20 m/s during a time of a) 5 s b) 0.4 s c) 0.08 s 4. A tennis ball may leave a top player’s racket on the serve with a speed of 60 m/s. If the ball’s mass is 0.05 kg and it is in contact with the racket for 0.02 s, what is the average force exerted on the ball? 5. A net force of 200 Newton’s is applied to a wagon for 4 seconds. This causes the wagon to undergo a change in momentum of? 6. A 2.4 kg ball has a momentum of 36 kg. m/s. What is the ball's speed? 7. A hockey player makes a slap shot, exerting a constant force of 35 N on the puck for 0.23 s. What is the magnitude of the impulse given to the puck? 8. A constant force of 15 N acts on a 5 kg object for 12 s. What are the changes in the object’s momentum and velocity? 9. Your friend’s mass is 50 kg, and he has a 1.80 kg skateboard. What is the combined momentum of your friend and his skateboard if they are going 4 m/s? 10. What is the momentum of a golf ball with a mass of 65 g moving at 53 m/s? Answers: 1. 0.03 s 2. 48000 N 3. a) 320 N, b) 400 N c) 200,000 N 4. 150 N 5. 800 N.s 6. 15 m/s 7. 8.05 N. s 8. a) 180 N .s b) 36 m/s 9. 207. 2 kg. m/s 10. 3.45 kg m/s