An 8kg mass moving at 8 m/s collides with a stationary 5 kg mass. After the collision, both the 8 kg and 5 kg mass move off in the same direction.
If the 8 kg mass is moving at 3 m/s, what is the speed of the 5 kg mass? *

Write the correct abbreviation for each metric unit

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.