a 3,000 kg railroad car moving at 6m/s to the east collides with a 7,000 kg railroad car moving at 4m/s to the west . if the cars couple together what is their velocity after the collision?

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

your answer would be “dry”

it's c (engineer's do their work with mechanical stuff not on any living being)