Because momentum is conserved, they are both stationary after the impact. average velocity = (20 + 0) ÷ 2 = 10 m/s During a collision, the crumple zone is shortened by 0.50 m.

Crumple zones refer to the areas of a car that are ... During a collision there is a change in momentum. The force of the collision is equal to the rate of change of momentum.