Question

A 10,000 [kg] railroad car A traveling at a speed of 10.0 [m/s] strikes an identical car B at rest. If the card lock together as a result of the collision, what is their common speed just afterward? Please give your answer in units of m/s.

Answer 1

Step-by-step explanation:

Use conservation of momentum

momentum of the one car before the collision is equal to the momentum of the two car system after the collision

10000 kg * 10 m/s = (10 000 + 10 000) kg * x m/s

x = 5 (m/s)