A 2000 kilogram railroad car moving at 5 m/sec to the East collides with a 6,000 kilogram railroad car moving at 3 m/sec to the west if the cars couple together what is their velocity after the collision

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

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 •  

70 give a real life example showing how sensory neurons work with the motor neurons