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When two objects push each other apart ... do they move away at different speeds?

...why is their total momentum zero?

When vehicles collide, what does the force of the impact depend on?

How does the impact of the force depend on the impact force?

What can we say about the impact forces and the total momentum when two vehicles collide?

Why do seatbelts and airbags reduce the force on people in car accidents?

How do side impact bars and crumple zones work?

How can we work out if a car in a crash was speeding?