Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?

Question

Two freight cars, each with a mass of 3.9  105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?

bobpursley · Answer

Conservation of momentum applies momentum before= momentum after 3.9E5*3.2m/s= (2*3.9E5)V