Determine the speed at which Superman (mass=79.0 kilogram) must fly into a train (mass = 19186 kilogram) traveling at 85.0 kilometer per hour to stop it.
Running into the train at that speed would severely damage both train and passengers. Find the minimum time Superman must take to stop the train, if the passengers experience an average horizontal force of 0.580 their own weight.
Determine how far does the train then travel while being slowed to a stop?