Example For example a train that weighs 1 kg moving at 500 m s and that hits a perfect steel wall where it uniformly decelerates from 500 m s to 0 m s in 02 seconds has an approximate impact force of 25000 N Thus a body which decelerates more quickly has a greater effective impact than one which decelerates more slowly I m not doubting the calculation here but the example is a bit unusual 500 meters per second is equivalent to about 1118 miles per hour faster than a bullet train And a 1 kg train is like a toy train or something so in my head I m imagining a toy train breaking the sound barrier and smashing into a steel wall I m not sure what a typical train weighs maybe 50 000 kg but apparently their max speed is about 50 mph or 80 km h or 22 222 m s 50 000 kg 22 m s 0 02s 55 000 000 N There Doesn t that turn into a nice number 130 184 250 29