two equal mass cars collide head to tail and their bumpers lock. One car has a velocity of 10m/s and the other is at rest. what is the velocity of the two cars after the collision?

Answer 1

initial momentum = 10 m + 0 = 10 m
so final momentum = 10 m
so
m v + m v = 10 m
2 v = 10
v = 5