Converting 108 km h-1 gives 30 m s-1. The change in momentum is 0.4 kg multiplied by 30 m s-1, which equals 12 kg m s-1. Dividing by 800 N force gives 0.015 seconds contact time.
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Converting 108 km h-1 gives 30 m s-1. The change in momentum is 0.4 kg multiplied by 30 m s-1, which equals 12 kg m s-1. Dividing by 800 N force gives 0.015 seconds contact time.