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To explore the difference between crashing a car at 70 mph and 85 mph, I will use a model. This car doesn’t have a crumple zone, it has a huge spring on the front. Here is a diagram.

I think I can do this without picking a mass of the car. Suppose that I have a car going 70 mph (31 m/s) and it crashes into a wall with a spring compression of 1 meter (I just randomly picked that). What would the value for m/k be?

Car Crash Compilation # 70 - YouTube

Car Crash Compilation # 70 Car Crash Compilation