eli5: What is the difference in force when two individuals are going at an equal speed and collide vs one individual going at that same speed and colliding with a non moving individual?

Question

eli5: What is the difference in force when two individuals are going at an equal speed and collide vs one individual going at that same speed and colliding with a non moving individual?

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Answer 1

Force is mass times velocity/time.. if both objects are moving, then velocity is higher and time is lower making force much higher.