1. 5. A 12,000kg. railroad car is traveling at 2m/s when it strikes another 10,000kg.railroad car that is at rest. If the cars lock together, what is the final speed of the two railroad cars?
Answers
Calculate the momentum of a 1200kg car with a velocity of 25m/s. Ans: 30,000kg.m/s 3. The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kg. m/s. What is the velocity of the vehicle? Ans: = 6.5m/s 4. A toy dart gun generates a dart with .140kg.m/s momentum and a velocity of 4m/s. What is the mass of the dart? Ans: .035kg 5. A 12,000kg. railroad car is traveling at 2m/s when it strikes another 10,000kg.railroad car that is at rest. If the cars lock together, what is the final speed of the two railroad cars? Ans: 1.1m/s 6. A 9,300 kg. railroad car traveling at a velocity of 15m/s strikes a second boxcar at rest. If the two cars stick together and move off with a velocity of 6m/s, what is the mass of the second car? Ans: 13,950 kg 7. A 20 gram bullet traveling at 250m/s strikes a block of wood that weighs 2kg. With what velocity will the block and bullet move after the collision? Ans: 2.5m/s A bullet with a mass of 20 g and a speed of 960 m/s strikes a block of wood of mass 4.5 kg resting on a horizontal surface. The bullet gets embedded in the block. The speed of the block immediately after the collision Ans: 4.25m/s.